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But here is something that scientists now know: A team led by Professor Fu has reported the first genetic link to how much sleep we need.

VOA: special.2009.08.26

And in these experiments we not only need to learn what has been learnt, but also have to learn what it is that we don't know.

在这些试验里我们不仅,要知道已知的知识，还要知道,我们不知道的内容。

麻省理工公开课 - 媒体、教育、市场课程节选

You need a substance and then that substance has to have a property that changes depending on the heat flow, i.e., depending on whether it's sensing that it's the same temperature or different temperature than something else.

你需要某种物质,它的某种性质,随着热量的流动而改变，也就是说,依赖于它是否感觉到它,与其他的物体处于相同的温度。

麻省理工公开课 - 热力学与动力学课程节选

At present it has no need to colonize Siberia purely for agriculture, since Russia has plenty of arable land in more hospitable climates.

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That would mean the UK government, which refuses to make such a request, saying it has no need to consider how Scottish independence, which it opposes, would work.

BBC: Scotland politics

After all, an algorithm has no need to generate income to support itself and its dependents.

FORBES: Why I Choose Software Over A Human For Investment Advice