necessity /nɪˈsɛsəti/ noun plural necessities
plural necessities
Learner's definition of NECESSITY
1
[count] : something that you must have or do : something that is necessary必需的事物；必需品 -
Sunscreen is an absolute necessity for the beach.去海滩玩防晒霜绝对是必备品。
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food, clothes, and other basic necessities吃的、穿的和其他基本必需品
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Getting plenty of rest is a necessity.充分的休息是很必要的。
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Without a car, living close to work is a necessity.没有车，就必须住在离上班地点近的地方。
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All we took with us on our hiking trip were the bare necessities.徒步旅行中，我们只随身携带最基本的生活必需品。
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Many families cannot even afford the basic/bare necessities of life. [=things that a person must have in order to survive]许多家庭甚至买不起基本生活必需品。
2
[noncount] formal : the quality of being necessary必要性 —
usually + of or for -
She talked about the necessity of having the right training. [=she said that having the right training is necessary]她谈到了接受正规培训的必要性。
-
He questioned the necessity for the change. [=he questioned whether the change was necessary]他质疑此次变革的必要性。
by necessity
or out of necessity
: because of conditions that cannot be changed必定；不可避免地 -
The process is by necessity a slow one. [=the process is necessarily slow; the slowness of the process cannot be avoided]进展慢无法避免。
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He works two jobs out of necessity. [=because it is necessary]他只得做两份工作。
make a virtue (out) of necessity
— see virtue
necessity is the mother of invention
— see 1mother
of necessity
formal
—
used to say that something must happen or must be the way it is势必发生