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ADJ-GRADED
必要的;必需的
Something that is necessary is needed in order for something else to happen.
例句
I kept the engine running because it might be necessary to leave fast...
我沒讓發動機熄火，因為也許需要迅速離開。
We will do whatever is necessary to stop them...
我們要采取一切必要措施去阻止他們。
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ADJ
(結果或聯系)必然的，勢必的
A necessary consequence or connection must happen or exist, because of the nature of the things or events involved.
例句
Wastage was no doubt a necessary consequence of war...
巨大的損耗無疑是戰爭的必然結果。
Scientific work is differentiated from art by its necessary connection with the idea of progress.
科學工作與藝術的區別在于它與人類進步有著必然聯系。
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N-PLURAL
基本生活必需;必需品
Necessaries are things, such as food or clothing, that you need to have in order to live.
例句
...a small parcel of necessaries tied up in a handkerchief and carried on a stick.
用手絹包好挑在棍子上的一小包生活必需品
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PHRASE
如果必要的話
If you say that something will happen if necessary ,when necessary, or where necessary, you mean that it will happen if it is necessary, when it is necessary, or where it is necessary.
例句
If necessary, the airship can stay up there for days to keep out of danger...
必要時，飛艇能在那里停留數天以躲避危險。
The army needs men who are willing to fight, when necessary...
軍隊需要在必要時愿意投入戰斗的軍人。