来自《耶鲁大学开放课程：生物医学工程探索 第17集 第17集》

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  For water the input is mainly the water that you drink
  对于水分输入主要是你所喝的水
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  or that you've taken in food
  或者你吃东西时摄入的水
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  because some foods contain high quantities of water too.
  因为某些食物也含有大量的水
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  For a normal individual you're going to take about
  一个人一般一天
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  2.1 L of water in per day in food and drink.
  从饮食和饮水中摄入2.1升水
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  You synthesize some water because some of the chemical reactions
  你会合成一部分水因为某些新陈代谢中的
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  that occur during metabolism have water as a byproduct,
  化学反应的副产物有水
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  so you synthesize some water.
  因此你也会合成部分水
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  Your overall daily intake is about 2.3 L of water per day.
  你的总体日摄入水量大约2.3升
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  You have to get rid of that water,
  你必须得将它们排出去
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  because if you're taking in water and you're not getting rid of it
  因为假如你只摄入水不排出水
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  then you're expanding your volume.You get rid of it in a variety of ways,
  那你的体积就会不断增大