necessary

英['nesisəri]美['nesisəri]

adj.
1. 必要的；必需的
2. 必然的；不可避免的
3. 迫不得已的，非做不行的，非自愿的，不自由的
n.
1. 必需品
2. 必要物；必要，必须
3. （用复数）【法律】生活必需品

复　数：necessaries

同反义词

同：	[n.] essential, necessity, requirement, requisite
反：	[n.] inessential, nonessential [a.] unnecessary, unneeded

词义辨析

indispensable，essential，necessary，requisite

这些形容词均有“必不可少的，必需的”之意。
indispensable语气强，侧重指绝对必要性或不可缺少性。
essential指对事物本身性质具有决定性的重要性，暗含不可缺少，否则便无法存在。
necessary最常用词，侧重由客观因素决定的某种需要，强调不可避免，但并非绝不可缺少。
requisite正式用词，特指为实现某一目的或得到某种结果而应有的需要，有时可与necessary换用。

参考例句

The bane of preemptive action is the impossibility of proving it was necessary.
先发制人论者的致命弱点在于无法证明其行动的必要性。收藏
interwoven as is the love of liberty with every ligament of your hearts, no recommendation of mine is necessary to fortify or confirm the attachment.
你们的心弦与自由丝丝相扣，因此用不着我来增强或坚定你们对自由的热爱。收藏
It is necessary to explicitly introduce chemical kinetic limitations into the envelope flame model.
显然必须把化学动力学限制引入外边层火焰模型。收藏
Always proofread completed letters very carefully.Consult dictionary when necessary or in doubt.
完成的书信一定要很小心地校对，有必要或怀疑时查典。收藏
It is necessary to consolidate and develop unswervingly the public sector of the economy.
必须毫不动摇地巩固和发展公有制经济。收藏

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英英解释

名词解释：

anything indispensable
- food and shelter are necessities of life
- the essentials of the good life
- allow farmers to buy their requirements under favorable conditions
- a place where the requisites of water fuel and fodder can b
[同] essential, necessary, necessity, requirement, requisite
[反] inessential, nonessential

形容词解释：

absolutely essential
[反] unnecessary, unneeded
unavoidably determined by prior circumstances
- the necessary consequences of one's actions

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