Question

once once ★★★★★/wʌ̱ns/1[ADV	副词]一次；一回 If something happens once, it happens one time only.   [ADV with v]  [the/this PRON]I met Wilma once, briefly...我曾经和威尔玛有过短短的一面之缘。Since that evening I haven't once slept through the night...从那天晚上之后，我没有睡过一次安稳觉。Mary had only been to Manchester once before.玛丽以前只去过一次曼彻斯特。Once is also a pronoun.'Have they been to visit you yet?' — 'Just the once, yeah.'...“他们来看过你吗？”——“来过，就一次。”Listen to us, if only this once.听我们的吧，哪怕就这么一次。2[ADV	副词]（与后接day, week, month等的a连用）（每…）一次，（每…）一回 You use once with 'a' and words like 'day', 'week', and 'month' to indicate that something happens regularly, one time in each day, week, or month.   [ADV a n]Lung cells die and are replaced about once a week...肺细胞约每周新老更替一次。We arranged a special social event once a year to which we invited our major customers.我们每年举办一次专门的社交活动，邀请重要客户出席。3[ADV	副词]（与后接day, week, year等的every连用）（每隔…）一次，（每隔…）一回 You use once with 'every' and words like 'day', 'week', and 'year' to indicate that something happens a specified number of times and on a regular basis.   [ADV every n]The patient was seen for follow-up visits once every three months...这位病人每三个月接受一次随访就诊。My daughter comes to visit me once every fortnight.我女儿每两周来看我一次。4[ADV	副词]曾经，一度（状况如此） If something was once true, it was true at some time in the past, but is no longer true.   [ADV with v]The culture minister once ran a theatre...这位文化部长曾经经营过一家剧院。I lived there once myself, before I got married...我结婚前曾独自在那儿住过。The house where she lives was once the village post office...她现在住的房子曾经是村里的邮局。My memory isn't as good as it once was.我的记性赶不上从前了。...an undulating park, once lovely but now ruined by new buildings.曾经景色秀美、而今被新建筑糟蹋得面目全非的高低错落的庭园5[ADV	副词]曾经（做过某事） If someone once did something, they did it at some time in the past.   [ADV with v]I once went camping at Lake Darling with a friend...我曾和一位朋友在达令湖畔露营。We once walked across London at two in the morning...我们曾在凌晨两点步行穿过伦敦。Diana had taken that path once.黛安娜曾走过那条路。6[CONJ-SUBORD	连词]一旦…（就…)； 一…（就…） If something happens once another thing has happened, it happens immediately afterwards. The decision had taken about 10 seconds once he'd read a market research study...在他看过一份市场调研报告后大概10秒钟就作出了决定。Once customers come to rely on these systems they almost never take their business elsewhere...顾客一旦依赖上这些系统，几乎就不会光顾其他商家。Once inside her apartment she felt an urge to brush her teeth.一回到自己的公寓，她就有一种想要刷牙的冲动。7[PHRASE	短语]突然；忽然 If something happens all at once, it happens suddenly, often when you are not expecting it to happen.   [PHR with cl]I feel terribly sleepy all at once...我突然觉得特别困。All at once there was someone knocking on the door.忽然有人敲门。8[PHRASE	短语]立即；马上 If you do something at once, you do it immediately.   [PHR with v]I have to go, I really must, at once...我得走了，我真的必须马上就走。Remove from the heat, add the parsley, toss and serve at once...端离炉子，加上欧芹，颠起翻面后就立刻上桌。The audience at once greeted him warmly.观众立即对他作出了热情的反应。9[PHRASE	短语]同时；一起 If a number of different things happen at once or all at once, they all happen at the same time.   [PHR after v]You can't be doing two things at once...不能一心二用。No bank could ever pay off its creditors if they all demanded their money at once...如果所有的储户同时要求提取存款，没有哪家银行能办得到。She seems at once feminine and able to cope in a man's world.她看起来既有女人味，又能在男人的世界里游刃有余。10[PHRASE	短语]就此一次；破例一次 For once is used to emphasize that something happens on this particular occasion, especially if it has never happened before, and may never happen again.   [PHR with cl]  [emphasis]For once, dad is not complaining...爸爸这次破天荒地没有抱怨。His smile, for once, was genuine.只有这一次，他真诚地笑了。11[PHRASE	短语]又一次；再次 If something happens once again or once more, it happens again.   [PHR with v]Amy picked up the hairbrush and smoothed her hair once more...埃米拿起发梳，再次将头发梳理整齐。Once again an official inquiry has spoken of weak management and ill-trained workers.官方调查又一次提到了管理不力与工人缺乏训练的问题。12[PHRASE	短语]彻底地；一劳永逸地 If something happens once and for all, it happens completely or finally.   [PHR with v]  [emphasis]We have to resolve this matter once and for all...我们必须彻底解决这一问题。If we act fast, we can once and for all prevent wild animals in Britain from suffering terrible cruelty.如果我们迅速采取行动，就可以一劳永逸地使英国的野生动物免受残忍的虐待。13[PHRASE	短语]偶尔；间或 If something happens once in a while, it happens sometimes, but not very often.   [PHR with cl]Earrings need to be taken out and cleaned once in a while.耳环要偶尔取出来清洗一下。Once in a while she phoned him.她间或会给他打个电话。14[PHRASE	短语]一两次；几次 If you have done something once or twice, you have done it a few times, but not very often.   [PHR with cl]I popped my head round the door once or twice...我有几次头撞到了门上。Once or twice she had caught a flash of interest in William's eyes...有那么一两次，她发现威廉的眼睛里流露出一丝感兴趣的神色。She gazed up at him, blinking once or twice, apparently surprised at his cleverness.她抬头注视着他，偶尔才眨一下眼睛，显然对他的聪明才智颇为惊讶。15[PHRASE	短语]（常用于儿童故事的开头）从前，很久以前 Once upon a time is used to indicate that something happened or existed a long time ago or in an imaginary world. It is often used at the beginning of children's stories.   [PHR with cl]'Once upon a time,' he began, 'there was a man who had everything.'...“很久很久以前，”他开始说道，“有这么一个人，他应有尽有。”Once upon a time, asking a woman if she has a job was quite a straightforward question.从前，问一位女性是否有工作是个相当简单直接的问题。16  once in a blue moon→see: moon；  once1 adverbonce2 conjunctiononceonce1 /wʌns/ ●●● S1 W1 adverb  Word Origin Examples Thesaurus Collocations Phrases 1on one occasion only:  I’ve only met her once. Paul’s been to Wexford once before.(just) the once British English spoken Mrs Peterson came in to see Ruth just the once.2once a week/once every three months etc one time every week etc, as a regular activity or event:  Staff meetings take place once a week. They took separate holidays at least once every two years.3at some time in the past, but not now:  Sonya and Ida had once been close friends. She and her husband had once owned a house like this.once-great/proud etc It was sad to see the once-great man looking so frail. the once-mighty steel industry4in the past, at a time that is not stated:  I once ran 21 miles. Marx once described religion as the ‘opium of the people’.5at once a)immediately or without delay:  Now, go upstairs at once and clean your room! When I saw him I recognized him at once. b)together, at the same time:  I can’t do two things at once! Don’t all talk at once.RegisterIn everyday English, when people mean 'immediately', they usually say right away or, in British English, straight away rather than at once:· I recognized him right away.6once more/once again a)again, after happening several times before:  I looked at myself in the mirror once more. Once again she’s refusing to help. b)used to say that a situation changes back to its previous state:  The crowds had all gone home and the street was quiet once more. c)formal used before you repeat something that you said before:  Once again, it must be stressed that the pilot was not to blame.7all at once a)if something happens all at once, it happens suddenly when you are not expecting it:  All at once there was a loud banging on the door. b)together, at the same time:  A lot of practical details needed to be attended to all at once.8(every) once in a while sometimes, although not often:  I do get a little anxious once in a while. I saw her in the shop every once in a while.9never once/not once used to emphasize that something has never happened:  I never once saw him get angry or upset. Not once did they finish a job properly.10(just) for once used to say that something unusual happens, especially when you wish it would happen more often:  Be honest for once. Just for once, let me make my own decision. For once Colin was speechless.11once and for all a)if you deal with something once and for all, you deal with it completely and finally:  Let’s settle this matter once and for all. b)British English spoken used to emphasize your impatience when you ask or say something that you have asked or said many times before:  Once and for all, will you switch off that television!12once or twice a few times:  I wrote to him once or twice, but he didn’t answer.13(just) this once spoken used to emphasize that this is the only time you are allowing something, asking for something etc, and it will not happen again:  Go on, lend me the car, just this once. I’ll make an exception this once.14once upon a time a)spoken at a time in the past that you think was much better than now:  Once upon a time you used to be able to leave your front door unlocked. b)a long time ago – used at the beginning of children’s stories15once in a blue moon informal very rarely:  It only happens like this once in a blue moon.16do something once too often to repeat a bad, stupid, or dangerous action with the result that you get punished or cause trouble for yourself:  He tried that trick once too often and in the end they caught him.17once a ..., always a ... spoken used to say that people stay the same and cannot change the way they behave and think:  Once a thief, always a thief.18once is/was enough spoken used to say that after you have done something one time you do not need or want to do it again19once bitten, twice shy used to say that people will not do something again if it has been a bad experienceonce1 adverbonce2 conjunctiononceonce2 ●●● S1 W1 conjunction  Examples Collocations Phrases  from the time when something happens:  Once I get him a job, he’ll be fine. Once in bed, the children usually stay there.

Accepted Answer

jEPoK/1xFvkT+4I2iOf8EbOwyv78K7GNwO7BFwlBJc4ChAeSZLj/xJBCo6/a1i3iVBK3MSfrbjjQNIx5RE3TDHim2suxdOAxK00A2nKa8az/b4GFzsHWZbRQnI9xmfWU1i1f/SkWh8tJydguVrv8zO7aW4gBnEhqCfD8yeiN8fu9H1pWje/JPaef2N4fRIUFdrKKPgzlGbH1pvhjf9ntYQ==             once              ★                    /        wʌns                ;          NAmE                wʌns                /                              adverb                ,                  conjunction                                          adverb        ★                    1      ★              on one occasion only; one time          仅一次；一次                            ◆        I've only been there once.        我只去过那里一次。                    ◆        He cleans his car          once aweek.                他每周洗一次汽车。                    ◆        She only sees her parents          once everysix months.                她每半年才探望一次父母。                    ◆        (          informal)                He only did it          the once.                这种事儿他仅仅干过一次。                    2      ★              at some time in the past          曾；曾经                            ◆        I once met your mother.        我曾经见过你母亲。                    ◆        He once lived in Zambia.        他曾在赞比亚生活过。                    ◆        This book was famous once, but nobody reads it today.        这本书曾名噪一时，但现在却无人问津。                    3              used in negative sentences and questions, and after          ifto mean ‘ever’ or ‘at all’          （用于否定句、疑问句和 if 后）曾，根本                            ◆        He never once offered to help.        他从没有主动提出过帮忙。                    ◆        If she once decides to do something, you won't change her mind.        她一旦决定干什么，谁也改变不了她的主意。                    IDIOMS              ˌall at ˈonce                  1          ★                      suddenly              突然；骤然；忽然                                            ◆            All at once she lost her temper.            她突然大发脾气。                                    2          ★                      all together; at the same time              一起；同时                                            SYN                                                            simultaneously                                                                          ◆            I can't do everything all at once—you'll have to be patient.            我不能万事一把抓呀。你可急不得。                                      at ˈonce                  1          ★                      immediately; without delay              立即；马上                                            ◆            Come here at once!            马上到这里来！                                    2                      at the same time              同时                                            SYN                                                            simultaneously                                                                          ◆            Don't all speak at once!            不要大家同时讲！                                ◆            I can't do two things at once.            我不能同时做两件事。                                      (just) for ˈonce | just this ˈonce                              (              informal)                        on this occasion (which is in contrast to what happens usually)              仅此一次（与通常情况对比而言）                                            ◆            Just for once he arrived on time.            只有这一次他按时到了。                                ◆            Can't you be nice to each other just this once?            难道你们就不能彼此客气哪怕一次？                                      going ˈonce, going ˈtwice, ˈsold                  (            especially NAmE)                                (                          BrE also                        ˌgoing, ˌgoing, ˈgone            )                                said by an              auctioneerto show that an item has been sold              （拍卖师用语）一次，二次，成交                                                  ★        once aˈgain | once ˈmore                              one more time; another time              再一次；再次                                            ◆            Once again the train was late.            火车又一次晚点了。                                ◆            Let me hear it just once more.            让我再听一遍。                                      once a…, always a…                              used to say that sb cannot change              （表示一个人不能改变） 一次为…便永远是…                                            ◆            Once an actor, always an actor.            一朝从艺，永为艺人。                                      once and for ˈall                              now and for the last time; finally or completely              最终地；最后地；彻底地；一次了结地                                            ◆            We need to settle this once and for all.            我们需要把这事一次解决。                                      ˌonce ˈbitten, ˌtwice ˈshy                              (              saying)                        after an unpleasant experience you are careful to avoid sth similar              一朝被蛇咬，十年怕井绳                                                  once in a blue ˈmoon                              (              informal)                        very rarely              极少地；难得地；破天荒地                                                  (every) ˌonce in a ˈwhile                              occasionally              偶尔地；间或                                                  ★        ˌonce or ˈtwice                              a few times              一两次；几次                                            ◆            I don't know her well, I've only met her once or twice.            我跟她不很熟，我只见过她一两次。                                      ˌonce too ˈoften                              used to say that sb has done sth wrong or stupid again, and this time they will suffer because of it              侥幸难再                                            ◆            You've tried that trick once too often.            你故伎重施，可这次再逃不脱了。                                      ˌonce upon a ˈtime                              used, especially at the beginning of stories, to mean ‘a long time in the past’              （用于故事的开头）从前，很久以前                                            ◆            Once upon a time there was a beautiful princess.            从前，有一位美丽的公主。                                                    conjunction        ★                    as soon as; when        一…就；一旦；当…时候                    ◆      We didn't know how we would cope once the money had gone.      一旦钱花光了，我们就不知道该怎么办了。              ◆      The water is fine once you're in!      你一旦下了水，就会觉得水里挺舒适。                  once              /        wʌns                ;          NAmE                wʌns                /             once[wʌns]CET4CET6TEM4考研IELTSc11893481565767990990856284713r3001367142105840969314252503018232ADV3793786171CONJ7852007642Spoken:232341152一次(62%)，曾经(21%)，一旦(16%)，曾经的(1%)adv.一次；曾经conj.一旦n.一次，一回

word	once
content	jEPoK/1xFvkT+4I2iOf8EbOwyv78K7GNwO7BFwlBJc4ChAeSZLj/xJBCo6/a1i3iVBK3MSfrbjjQNIx5RE3TDHim2suxdOAxK00A2nKa8az/b4GFzsHWZbRQnI9xmfWU1i1f/SkWh8tJydguVrv8zO7aW4gBnEhqCfD8yeiN8fu9H1pWje/JPaef2N4fRIUFdrKKPgzlGbH1pvhjf9ntYQ==
Collins	once ★★★★★ /wʌ̱ns/ 1 [ADV 副词]一次；一回 If something happens once, it happens one time only. [ADV with v] [the/this PRON] I met Wilma once, briefly... 我曾经和威尔玛有过短短的一面之缘。 Since that evening I haven't once slept through the night... 从那天晚上之后，我没有睡过一次安稳觉。 Mary had only been to Manchester once before. 玛丽以前只去过一次曼彻斯特。 Once is also a pronoun. 'Have they been to visit you yet?' — 'Just the once, yeah.'... “他们来看过你吗？”——“来过，就一次。” Listen to us, if only this once. 听我们的吧，哪怕就这么一次。 2 [ADV 副词]（与后接day, week, month等的a连用）（每…）一次，（每…）一回 You use once with 'a' and words like 'day', 'week', and 'month' to indicate that something happens regularly, one time in each day, week, or month. [ADV a n] Lung cells die and are replaced about once a week... 肺细胞约每周新老更替一次。 We arranged a special social event once a year to which we invited our major customers. 我们每年举办一次专门的社交活动，邀请重要客户出席。 3 [ADV 副词]（与后接day, week, year等的every连用）（每隔…）一次，（每隔…）一回 You use once with 'every' and words like 'day', 'week', and 'year' to indicate that something happens a specified number of times and on a regular basis. [ADV every n] The patient was seen for follow-up visits once every three months... 这位病人每三个月接受一次随访就诊。 My daughter comes to visit me once every fortnight. 我女儿每两周来看我一次。 4 [ADV 副词]曾经，一度（状况如此） If something was once true, it was true at some time in the past, but is no longer true. [ADV with v] The culture minister once ran a theatre... 这位文化部长曾经经营过一家剧院。 I lived there once myself, before I got married... 我结婚前曾独自在那儿住过。 The house where she lives was once the village post office... 她现在住的房子曾经是村里的邮局。 My memory isn't as good as it once was. 我的记性赶不上从前了。 ...an undulating park, once lovely but now ruined by new buildings. 曾经景色秀美、而今被新建筑糟蹋得面目全非的高低错落的庭园 5 [ADV 副词]曾经（做过某事） If someone once did something, they did it at some time in the past. [ADV with v] I once went camping at Lake Darling with a friend... 我曾和一位朋友在达令湖畔露营。 We once walked across London at two in the morning... 我们曾在凌晨两点步行穿过伦敦。 Diana had taken that path once. 黛安娜曾走过那条路。 6 [CONJ-SUBORD 连词]一旦…（就…)；一…（就…） If something happens once another thing has happened, it happens immediately afterwards. The decision had taken about 10 seconds once he'd read a market research study... 在他看过一份市场调研报告后大概10秒钟就作出了决定。 Once customers come to rely on these systems they almost never take their business elsewhere... 顾客一旦依赖上这些系统，几乎就不会光顾其他商家。 Once inside her apartment she felt an urge to brush her teeth. 一回到自己的公寓，她就有一种想要刷牙的冲动。 7 [PHRASE 短语]突然；忽然 If something happens all at once, it happens suddenly, often when you are not expecting it to happen. [PHR with cl] I feel terribly sleepy all at once... 我突然觉得特别困。 All at once there was someone knocking on the door. 忽然有人敲门。 8 [PHRASE 短语]立即；马上 If you do something at once, you do it immediately. [PHR with v] I have to go, I really must, at once... 我得走了，我真的必须马上就走。 Remove from the heat, add the parsley, toss and serve at once... 端离炉子，加上欧芹，颠起翻面后就立刻上桌。 The audience at once greeted him warmly. 观众立即对他作出了热情的反应。 9 [PHRASE 短语]同时；一起 If a number of different things happen at once or all at once, they all happen at the same time. [PHR after v] You can't be doing two things at once... 不能一心二用。 No bank could ever pay off its creditors if they all demanded their money at once... 如果所有的储户同时要求提取存款，没有哪家银行能办得到。 She seems at once feminine and able to cope in a man's world. 她看起来既有女人味，又能在男人的世界里游刃有余。 10 [PHRASE 短语]就此一次；破例一次 For once is used to emphasize that something happens on this particular occasion, especially if it has never happened before, and may never happen again. [PHR with cl] [emphasis] For once, dad is not complaining... 爸爸这次破天荒地没有抱怨。 His smile, for once, was genuine. 只有这一次，他真诚地笑了。 11 [PHRASE 短语]又一次；再次 If something happens once again or once more, it happens again. [PHR with v] Amy picked up the hairbrush and smoothed her hair once more... 埃米拿起发梳，再次将头发梳理整齐。 Once again an official inquiry has spoken of weak management and ill-trained workers. 官方调查又一次提到了管理不力与工人缺乏训练的问题。 12 [PHRASE 短语]彻底地；一劳永逸地 If something happens once and for all, it happens completely or finally. [PHR with v] [emphasis] We have to resolve this matter once and for all... 我们必须彻底解决这一问题。 If we act fast, we can once and for all prevent wild animals in Britain from suffering terrible cruelty. 如果我们迅速采取行动，就可以一劳永逸地使英国的野生动物免受残忍的虐待。 13 [PHRASE 短语]偶尔；间或 If something happens once in a while, it happens sometimes, but not very often. [PHR with cl] Earrings need to be taken out and cleaned once in a while. 耳环要偶尔取出来清洗一下。 Once in a while she phoned him. 她间或会给他打个电话。 14 [PHRASE 短语]一两次；几次 If you have done something once or twice, you have done it a few times, but not very often. [PHR with cl] I popped my head round the door once or twice... 我有几次头撞到了门上。 Once or twice she had caught a flash of interest in William's eyes... 有那么一两次，她发现威廉的眼睛里流露出一丝感兴趣的神色。 She gazed up at him, blinking once or twice, apparently surprised at his cleverness. 她抬头注视着他，偶尔才眨一下眼睛，显然对他的聪明才智颇为惊讶。 15 [PHRASE 短语]（常用于儿童故事的开头）从前，很久以前 Once upon a time is used to indicate that something happened or existed a long time ago or in an imaginary world. It is often used at the beginning of children's stories. [PHR with cl] 'Once upon a time,' he began, 'there was a man who had everything.'... “很久很久以前，”他开始说道，“有这么一个人，他应有尽有。” Once upon a time, asking a woman if she has a job was quite a straightforward question. 从前，问一位女性是否有工作是个相当简单直接的问题。 16 once in a blue moon→see: moon ；
Oxford	once ★ / wʌns ; NAmE wʌns / adverb , conjunction adverb ★ 1 ★ on one occasion only; one time 仅一次；一次 ◆ I've only been there once. 我只去过那里一次。 ◆ He cleans his car once aweek. 他每周洗一次汽车。 ◆ She only sees her parents once everysix months. 她每半年才探望一次父母。 ◆ ( informal) He only did it the once. 这种事儿他仅仅干过一次。 2 ★ at some time in the past 曾；曾经 ◆ I once met your mother. 我曾经见过你母亲。 ◆ He once lived in Zambia. 他曾在赞比亚生活过。 ◆ This book was famous once, but nobody reads it today. 这本书曾名噪一时，但现在却无人问津。 3 used in negative sentences and questions, and after ifto mean ‘ever’ or ‘at all’ （用于否定句、疑问句和 if 后）曾，根本 ◆ He never once offered to help. 他从没有主动提出过帮忙。 ◆ If she once decides to do something, you won't change her mind. 她一旦决定干什么，谁也改变不了她的主意。 IDIOMS ˌall at ˈonce 1 ★ suddenly 突然；骤然；忽然 ◆ All at once she lost her temper. 她突然大发脾气。 2 ★ all together; at the same time 一起；同时 SYN simultaneously ◆ I can't do everything all at once—you'll have to be patient. 我不能万事一把抓呀。你可急不得。 at ˈonce 1 ★ immediately; without delay 立即；马上 ◆ Come here at once! 马上到这里来！ 2 at the same time 同时 SYN simultaneously ◆ Don't all speak at once! 不要大家同时讲！ ◆ I can't do two things at once. 我不能同时做两件事。 (just) for ˈonce \| just this ˈonce ( informal) on this occasion (which is in contrast to what happens usually) 仅此一次（与通常情况对比而言） ◆ Just for once he arrived on time. 只有这一次他按时到了。 ◆ Can't you be nice to each other just this once? 难道你们就不能彼此客气哪怕一次？ going ˈonce, going ˈtwice, ˈsold ( especially NAmE) ( BrE also ˌgoing, ˌgoing, ˈgone ) said by an auctioneerto show that an item has been sold （拍卖师用语）一次，二次，成交 ★ once aˈgain \| once ˈmore one more time; another time 再一次；再次 ◆ Once again the train was late. 火车又一次晚点了。 ◆ Let me hear it just once more. 让我再听一遍。 once a…, always a… used to say that sb cannot change （表示一个人不能改变）一次为…便永远是… ◆ Once an actor, always an actor. 一朝从艺，永为艺人。 once and for ˈall now and for the last time; finally or completely 最终地；最后地；彻底地；一次了结地 ◆ We need to settle this once and for all. 我们需要把这事一次解决。 ˌonce ˈbitten, ˌtwice ˈshy ( saying) after an unpleasant experience you are careful to avoid sth similar 一朝被蛇咬，十年怕井绳 once in a blue ˈmoon ( informal) very rarely 极少地；难得地；破天荒地 (every) ˌonce in a ˈwhile occasionally 偶尔地；间或 ★ ˌonce or ˈtwice a few times 一两次；几次 ◆ I don't know her well, I've only met her once or twice. 我跟她不很熟，我只见过她一两次。 ˌonce too ˈoften used to say that sb has done sth wrong or stupid again, and this time they will suffer because of it 侥幸难再 ◆ You've tried that trick once too often. 你故伎重施，可这次再逃不脱了。 ˌonce upon a ˈtime used, especially at the beginning of stories, to mean ‘a long time in the past’ （用于故事的开头）从前，很久以前 ◆ Once upon a time there was a beautiful princess. 从前，有一位美丽的公主。 conjunction ★ as soon as; when 一…就；一旦；当…时候 ◆ We didn't know how we would cope once the money had gone. 一旦钱花光了，我们就不知道该怎么办了。 ◆ The water is fine once you're in! 你一旦下了水，就会觉得水里挺舒适。 once / wʌns ; NAmE wʌns /
LDC	once1 adverb once2 conjunction onceonce1 /wʌns/ ●●● S1 W1 adverb Word Origin Examples Thesaurus Collocations Phrases 1on one occasion only: I’ve only met her once. Paul’s been to Wexford once before.(just) the once British English spoken Mrs Peterson came in to see Ruth just the once.2once a week/once every three months etc one time every week etc, as a regular activity or event: Staff meetings take place once a week. They took separate holidays at least once every two years.3at some time in the past, but not now: Sonya and Ida had once been close friends. She and her husband had once owned a house like this.once-great/proud etc It was sad to see the once-great man looking so frail. the once-mighty steel industry4in the past, at a time that is not stated: I once ran 21 miles. Marx once described religion as the ‘opium of the people’.5at once a)immediately or without delay: Now, go upstairs at once and clean your room! When I saw him I recognized him at once. b)together, at the same time: I can’t do two things at once! Don’t all talk at once.RegisterIn everyday English, when people mean 'immediately', they usually say right away or, in British English, straight away rather than at once:· I recognized him right away.6once more/once again a)again, after happening several times before: I looked at myself in the mirror once more. Once again she’s refusing to help. b)used to say that a situation changes back to its previous state: The crowds had all gone home and the street was quiet once more. c)formal used before you repeat something that you said before: Once again, it must be stressed that the pilot was not to blame.7all at once a)if something happens all at once, it happens suddenly when you are not expecting it: All at once there was a loud banging on the door. b)together, at the same time: A lot of practical details needed to be attended to all at once.8(every) once in a while sometimes, although not often: I do get a little anxious once in a while. I saw her in the shop every once in a while.9never once/not once used to emphasize that something has never happened: I never once saw him get angry or upset. Not once did they finish a job properly.10(just) for once used to say that something unusual happens, especially when you wish it would happen more often: Be honest for once. Just for once, let me make my own decision. For once Colin was speechless.11once and for all a)if you deal with something once and for all, you deal with it completely and finally: Let’s settle this matter once and for all. b)British English spoken used to emphasize your impatience when you ask or say something that you have asked or said many times before: Once and for all, will you switch off that television!12once or twice a few times: I wrote to him once or twice, but he didn’t answer.13(just) this once spoken used to emphasize that this is the only time you are allowing something, asking for something etc, and it will not happen again: Go on, lend me the car, just this once. I’ll make an exception this once.14once upon a time a)spoken at a time in the past that you think was much better than now: Once upon a time you used to be able to leave your front door unlocked. b)a long time ago – used at the beginning of children’s stories15once in a blue moon informal very rarely: It only happens like this once in a blue moon.16do something once too often to repeat a bad, stupid, or dangerous action with the result that you get punished or cause trouble for yourself: He tried that trick once too often and in the end they caught him.17once a ..., always a ... spoken used to say that people stay the same and cannot change the way they behave and think: Once a thief, always a thief.18once is/was enough spoken used to say that after you have done something one time you do not need or want to do it again19once bitten, twice shy used to say that people will not do something again if it has been a bad experience once1 adverb once2 conjunction onceonce2 ●●● S1 W1 conjunction Examples Collocations Phrases from the time when something happens: Once I get him a job, he’ll be fine. Once in bed, the children usually stay there.
WDF	once [wʌns] CET4CET6TEM4考研IELTS c1189 34815 6576 7990 9908 5628 4713 r300 136714 21058 40969 31425 25030 18232 ADV379 3786171 CONJ785 2007642 Spoken: 232341152 一次(62%)，曾经(21%)，一旦(16%)，曾经的(1%) adv.一次；曾经 conj.一旦 n.一次，一回

Time I Phrase 短语 [Phr V Spoken I

once

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