necessity的意思是：n.需要；必需品；必然。necessity的例句是用作名词(n.)Necessity is the mother of invention.需要是发明之母。necessity名词复数:necessities。
一、双解释义点此查看necessity的详细内容
二、词典解释
1.必然;必要
Thenecessity of something is the fact that it must happen or exist.
e.g. There is agreement on thenecessity of reforms...
对改革的必要性已经达成了共识。
e.g. As soon as thenecessity for action is over the troops must be withdrawn...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。
2.必需品;必不可少的事物
Anecessity is something that you must have in order to live properly or do something.
e.g. Water is a basicnecessity of life.
生命离不开水。
e.g. ...food, fuel and other daily necessities.
食物、燃料和其他日常必需品
3.不可避免的情况(或行动)
A situation or action that is anecessity is necessary and cannot be avoided.
e.g. The President pleaded that strong rule from the centre was a regrettable, but temporarynecessity.
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。
三、例句
Necessity is the mother of invention.
需要是发明之母。
Want and necessity break faiths and oaths.
匮乏和需要可以打破信仰和誓言。
Water is of vital necessity in the desert.
在沙漠地区水是维持生命的必需品。
Food is a necessity, but wine is an extravagance.
食物是必需品,而酒则是奢侈品。
The necessity for making decisions devolves on him.
作出决策乃当务之急，此事必然地落在他身上。
That men would die was a matter of necessity; which men would die, though, was a matter of circumstance.
人总有一死，这是必然的事，不过哪些人死，这是偶然的事。
四、常见句型
五、词汇搭配
necessity的相关近义词
necessity的相关反义词
necessity的相关临近词
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