It is necessary to control your weight.

很有必要控制体重。

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Do you think it is necessary to control the news coverage?

你认为控制新闻报道有必要吗？

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First, it is necessary to control excessive demand, but also to ensure the effective supply.

首先，它是必要的控制过度的需求，而且也是为了确保有效供给。

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How is it that some people came to acquire this capacity for rational self-control that is necessary for freedom ? and others seem to lack it?

为何有些人,会拥有这种理性自控的能力,那也是自由的必备条件,但有些人却似乎不具备这种能力？

耶鲁公开课 - 政治哲学导论课程节选

They do not need to run for two hours in the same pace, they need to run when it is necessary with the ball under control.

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It is necessary to reduce that stake below the level at which it can control or direct the way the company acts.

BBC: BAE-EADS merger: France and Germany 'must reduce stake'

It is necessary to have a steady rising of potential for improvement of integrated control of underground water on national and international levels.

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