Question

alert adj.提防的,警惕的 n.警惕,警报 Alert is one of the rare words that can be used in the same form as a noun, verb, and adjective. In all parts of speech, alert implies preparedness. The word is derived from the French a l'erte which translates to "on the watch." When you hear the word, imagine an alarm going off. The alarm is the alert. When you hear it, you have been alerted and you are now alert. ★★★☆☆ 2007.3

Accepted Answer

[ə'lə:t] Alert! Alert! Alert! Did I get your attention? When you are alert, you are awake and ready. When you issue an alert you give warning, alerting people to, or notifying them of, a concern. The Middle Class on the Alert 1[ADJ-GRADED 能被表示程度的副词或介词词组修饰的形容词]警觉的；警惕的；留神的；机敏的 If you are alert, you are paying full attention to things around you and are able to deal with anything that might happen. We all have to stay alert...我们大家都必须保持警惕。He had been spotted by an alert neighbour.一个警觉的邻居发现了他。alertnessThe drug improved mental alertness.该药有助于提神。2[ADJ-GRADED 能被表示程度的副词或介词词组修饰的形容词]充分意识到…的；完全感觉到…的 If you are alert to something, you are fully aware of it.   [v-link ADJ to n]The bank is alert to the danger.银行充分意识到了危险。3[N-COUNT 可数名词]警戒（状态）；戒备（状态） An alert is a situation in which people prepare themselves for something dangerous that might happen soon. Due to a security alert, this train will not be stopping at Oxford Circus.由于安全戒备的原因，该次列车在“牛津街口广场”站将不停留。4[VERB 动词]向…报警；使警觉；使警惕；使注意 If you alert someone to a situation, especially a dangerous or unpleasant situation, you tell them about it.   [V n to n]  [V n]He wanted to alert people to the activities of the group...他想提醒人们小心该团体的活动。I was hoping he'd alert the police.我当时希望他会报警。5See also:red alert；  6[PHRASE 短语]处于警戒状态；保持戒备 If soldiers or police are on alert, they are ready to deal with anything that may happen.   [PHR after v]Soldiers and police have been put on alert.士兵和警方都已进入警戒状态。7[PHRASE 短语]准备就绪；防备着 If you are on the alert for something, you are ready to deal with it if it happens.   [PHR after v]They want to be on the alert for similar buying opportunities.他们希望随时掌握有关类似购买机会的信息。

英语单词	alert
英美音标	[ə'lə:t]
中文释义	adj.提防的,警惕的 n.警惕,警报
vocab简明	Alert! Alert! Alert! Did I get your attention? When you are alert, you are awake and ready. When you issue an alert you give warning, alerting people to, or notifying them of, a concern.
vocab扩展	Alert is one of the rare words that can be used in the same form as a noun, verb, and adjective. In all parts of speech, alert implies preparedness. The word is derived from the French a l'erte which translates to "on the watch." When you hear the word, imagine an alarm going off. The alarm is the alert. When you hear it, you have been alerted and you are now alert.
真题原句	The Middle Class on the Alert
柯林斯星级	★★★☆☆
柯林斯解释	1 [ADJ-GRADED 能被表示程度的副词或介词词组修饰的形容词]警觉的；警惕的；留神的；机敏的 If you are alert, you are paying full attention to things around you and are able to deal with anything that might happen. We all have to stay alert... 我们大家都必须保持警惕。 He had been spotted by an alert neighbour. 一个警觉的邻居发现了他。 alertness The drug improved mental alertness. 该药有助于提神。 2 [ADJ-GRADED 能被表示程度的副词或介词词组修饰的形容词]充分意识到…的；完全感觉到…的 If you are alert to something, you are fully aware of it. [v-link ADJ to n] The bank is alert to the danger. 银行充分意识到了危险。 3 [N-COUNT 可数名词]警戒（状态）；戒备（状态） An alert is a situation in which people prepare themselves for something dangerous that might happen soon. Due to a security alert, this train will not be stopping at Oxford Circus. 由于安全戒备的原因，该次列车在“牛津街口广场”站将不停留。 4 [VERB 动词]向…报警；使警觉；使警惕；使注意 If you alert someone to a situation, especially a dangerous or unpleasant situation, you tell them about it. [V n to n] [V n] He wanted to alert people to the activities of the group... 他想提醒人们小心该团体的活动。 I was hoping he'd alert the police. 我当时希望他会报警。 5 See also:red alert ； 6 [PHRASE 短语]处于警戒状态；保持戒备 If soldiers or police are on alert, they are ready to deal with anything that may happen. [PHR after v] Soldiers and police have been put on alert. 士兵和警方都已进入警戒状态。 7 [PHRASE 短语]准备就绪；防备着 If you are on the alert for something, you are ready to deal with it if it happens. [PHR after v] They want to be on the alert for similar buying opportunities. 他们希望随时掌握有关类似购买机会的信息。
来源	2007.3

Alert People Deal N I Hear Alarm Adj Graded