How much water do you need?

你要多少水？

《牛津词典》

You have to touch the leaves with your hands to feel how much water is being removed.

你必须用手触摸叶子，才能感觉到有多少水分被除去了。

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The questions become more complicated when actual volumes of water are considered: how much water enters and leaves by each route?

当考虑水的实际体积时，问题变得更加复杂：每条支流会有多少水流进及流出呢？

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How many hours a day the pump needs to be operated depends on the season and how much water is needed for crops.

VOA: special.2009.08.17

Well how much sense does it make to ship water to the U.S. from France?

从法国进口水到美国有意义吗

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The amount of water that you need to have the optimal sort of concentrations of things is determined by how much urine your kidneys produce and how much they excrete each day.

为了保持体内物质的理想浓度,所需的水量,取决于肾脏每天产生,以及排出体外的尿量

耶鲁公开课 - 生物医学工程探索课程节选

Well the breakdown of who uses how much water in what ways is kind of surprising.

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Then consumers would decide how much water was worth to them, and buy accordingly.

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"We really want to know how much water is under the ice sheet, " she said.

CNN: NASA flights will study Antarctic ice changes