necessity

名词 necessity:

1. the condition of being essential or indispensable
2. anything indispensable
   同义词：essential, requirement, requisite, necessary

1. It was done under the pressure of the necessity.
   这件事是在迫切需要的情况下而做的。
2. Necessity is the mother of invention.
   需要是发明之母。
3. The doctor asked us to call him during the night except in case of necessity.
   医生吩咐我们，除非必须，否则不要在夜里叫他。

ne.ces.si.ty

n.（名词）
【复数】 ne.ces.si.ties

The condition or quality of being necessary.
需要：需要的条件或性质
Something necessary:
必需品：必需的东西：
例句：
The necessities of life include food, clothing, and shelter.
生命的必需的，包括食物，衣服，住处

Something dictated by invariable physical laws.
必然性：由不变的自然规律决定的东西
The force exerted by circumstance.
必然力：环境施加的压力
The state or fact of being in need.
需要：需要的状态或事实
Pressing or urgent need, especially that arising from poverty.See Synonyms at need
困难，危急：急切的，紧迫的需要，尤其是从贫穷中产生的参见 need

<习惯用语>of necessity
As an inevitable consequence; necessarily.
无法避免的；必然地
来源：
Middle English necessite
中古英语 necessite
from Old French
源自 古法语
from Latin necessit3s
源自 拉丁语 necessit3s
from necesse [necessary] * see necessary
源自 necesse [必然的] *参见 necessary