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At the beginning, the pupils put solutions to the homework on the board, then the teachers comment, correct or elaborate as necessary.

一开始，小学生们将家庭作业的答案写在黑板上，随后老师评论、纠正，或在必要时详细解释。

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For her, books were as necessary to life as bread.

对她来说，书就像面包一样是生活的必需。

《柯林斯英汉双解大词典》

That violence brought an overnight curfew to Port Gentil which was repeated Friday and will continue, Ndongou says, "as long as necessary if calm does not prevail."

VOA: standard.2009.09.05

We tend to think of the separation of powers doctrine as necessary for the security and liberty of the individual ? don't we?

我们倾向于,将分权原理想成是,个人安全与自由的必备条件,不是吗？

耶鲁公开课 - 政治哲学导论课程节选

Eliot was there, in that essay on the metaphysical poets that I'm quoting from, defending as necessary what is the primary characteristic, not only of his own poetry, but really of modern poetry generally, what is often called its difficulty.

艾略特在描写那些抽象派诗人的文章里,就是我引用的那篇，极力维护,诗人的首要特征，不仅是因为他自身的诗性，更因为维护现代诗歌的必要，这是非常困难的一件事。

耶鲁公开课 - 现代诗歌课程节选

Hayek pointed out that central bankers had often defended their policies as necessary to prevent deflation.

FORBES: Cutting Old Age Entitlements: Why Japan Can Lead the Way

Our shore-side customer care team and ship's medical team are providing support as necessary.

BBC: Two arrested over shooting of cruise couple in Barbados

We all want as much as possible for as little effort or risk as necessary.

FORBES: Our Denial of Nature Undermines the Economic Recovery