Question

necessity n.需要；必需品；必然 (1) 需要是发明之母。(2) 匮乏和需要可以打破信仰和誓言。(3) 在沙漠地区水是维持生命的必需品。(4) 食物是必需品,而酒则是奢侈品。(5) 作出决策乃当务之急，此事必然地落在他身上。(6) 人总有一死，这是必然的事，不过哪些人死，这是偶然的事。 When used in the plural, necessities are items required for a situation but nothing extra. You probably only bring the bare necessities to a sleepover — pajamas and a toothbrush. Sometimes a necessity is a thing you must know how to do. Knowing how to balance your checkbook is a financial necessity. In some cases, necessity simply means "need." Do you do your homework out of necessity or because you want to?

Accepted Answer

英 [nə'sesəti] 美 [nə'sesəti] (1) Necessity is the mother of invention.(2) Want and necessity break faiths and oaths.(3) Water is of vital necessity in the desert.(4) Food is a necessity, but wine is an extravagance.(5) The necessity for making decisions devolves on him.(6) That men would die was a matter of necessity; which men would die, though, was a matter of circumstance. A good camping knife is a necessity if you’re going to be hiking in a heavily forested region. A necessity is something that you must have in order to complete a task. 1[N-UNCOUNT 不可数名词]必然；必要 The necessity of something is the fact that it must happen or exist.   [usu with supp]  [usu PHR before v]  [FORMAL 正式]There is agreement on the necessity of reforms...对改革的必要性已经达成了共识。As soon as the necessity for action is over the troops must be withdrawn...一旦军事行动的必要性不复存在，军队就必须撤出。Most women, like men, work from economic necessity...与男人一样，大部分女人也是出于经济原因而工作。Some people have to lead stressful lifestyles out of necessity.一些人迫于生计不得不过着紧张忙碌的生活。If you say that something is of necessity the case, you mean that it is the case because nothing else is possible or practical in the circumstances.势必；必定The assembly line of necessity kept moving...生产线势必保持运转下去。Negotiations between the enemies are of necessity indirect.敌手之间的谈判必定是间接的。2[N-COUNT 可数名词]必需品；必不可少的事物 A necessity is something that you must have in order to live properly or do something. Water is a basic necessity of life.生命离不开水。...food, fuel and other daily necessities.食物、燃料和其他日常必需品3[N-COUNT 可数名词]不可避免的情况(或行动) A situation or action that is a necessity is necessary and cannot be avoided.   [usu sing]The President pleaded that strong rule from the centre was a regrettable, but temporary necessity.总统辩解说，实行高度的中央集权虽不尽如人意，但暂时来说却是必要的。

英语单词	necessity
英美音标	英 [nə'sesəti] 美 [nə'sesəti]
中文释义	n.需要；必需品；必然
英语例句	(1) Necessity is the mother of invention. (2) Want and necessity break faiths and oaths. (3) Water is of vital necessity in the desert. (4) Food is a necessity, but wine is an extravagance. (5) The necessity for making decisions devolves on him. (6) That men would die was a matter of necessity; which men would die, though, was a matter of circumstance.
中文例句	(1) 需要是发明之母。 (2) 匮乏和需要可以打破信仰和誓言。 (3) 在沙漠地区水是维持生命的必需品。 (4) 食物是必需品,而酒则是奢侈品。 (5) 作出决策乃当务之急，此事必然地落在他身上。 (6) 人总有一死，这是必然的事，不过哪些人死，这是偶然的事。
vocabulary简明	A good camping knife is a necessity if you’re going to be hiking in a heavily forested region. A necessity is something that you must have in order to complete a task.
vocabulary扩展	When used in the plural, necessities are items required for a situation but nothing extra. You probably only bring the bare necessities to a sleepover — pajamas and a toothbrush. Sometimes a necessity is a thing you must know how to do. Knowing how to balance your checkbook is a financial necessity. In some cases, necessity simply means "need." Do you do your homework out of necessity or because you want to?
柯林斯解释	1 [N-UNCOUNT 不可数名词]必然；必要 The necessity of something is the fact that it must happen or exist. [usu with supp] [usu PHR before v] [FORMAL 正式] There is agreement on the necessity of reforms... 对改革的必要性已经达成了共识。 As soon as the necessity for action is over the troops must be withdrawn... 一旦军事行动的必要性不复存在，军队就必须撤出。 Most women, like men, work from economic necessity... 与男人一样，大部分女人也是出于经济原因而工作。 Some people have to lead stressful lifestyles out of necessity. 一些人迫于生计不得不过着紧张忙碌的生活。 If you say that something is of necessity the case, you mean that it is the case because nothing else is possible or practical in the circumstances.势必；必定 The assembly line of necessity kept moving... 生产线势必保持运转下去。 Negotiations between the enemies are of necessity indirect. 敌手之间的谈判必定是间接的。 2 [N-COUNT 可数名词]必需品；必不可少的事物 A necessity is something that you must have in order to live properly or do something. Water is a basic necessity of life. 生命离不开水。 ...food, fuel and other daily necessities. 食物、燃料和其他日常必需品 3 [N-COUNT 可数名词]不可避免的情况(或行动) A situation or action that is a necessity is necessary and cannot be avoided. [usu sing] The President pleaded that strong rule from the centre was a regrettable, but temporary necessity. 总统辩解说，实行高度的中央集权虽不尽如人意，但暂时来说却是必要的。

Necessity [Usu Water Men Matter Order Situation Action