来自《耶鲁大学开放课程：生物医学工程探索 第16集 第16集》

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  and assuming that these numbers are appropriate numbers for--
  假定这些数字是合适的数字
• 
  
  then you would have to pee out over 100 liters per day
  那么你每天将不得不尿出100升液体来
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  and you have to drink 100 liters of water per day
  那么你每天必须喝下100升水
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  in order to maintain your volume.
  以维持体液
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  What happens if you lose too much volume?
  如果你失去过多体积的水会怎么样
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  Then your ion concentrations go out of whack as well
  你的离子含量会变得紊乱
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  because they're not dissolved in the right volume of water.
  因为他们没有溶于正确体积的水中
• 
  
  Your kidney must have some other mechanism besides being a filter.
  肾脏必须有除过滤器以外的其他机制
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  In particular,it has to recover things that you need.
  特别是 它必须回收你所需的物质
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  Filtration is an important part of it,
  过滤是重要的一部分
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  but it also has to be selective in some way,
  但在某些情况下也必须有选择性
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  and filtration is not selective enough.
  而过滤的选择性不够