来自《耶鲁大学开放课程：生物医学工程探索 第13集 第13集》

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  It looks just like a circuit diagram because the equations are the same.
  它看上去像一个电路图 因为等式相同
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  That's what I've done here is taken this anatomical picture, cartoon,
  我在这里做的是将这幅卡通解剖图
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  and converted it into an equivalent circuit
  转化为一个等价回路
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  where I'm not thinking about flow of electrons now or current,
  只不过这里我考虑的不是电子流动与否
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  I'm thinking about flow of fluid.
  我要考虑的是流体流动
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  I'm drawing a resistance not as an electrical resistance
  我这里画的并不是电阻
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  but as a flow resistance; as this kind of a resistance.
  而是流体阻力 是这样一种阻力
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  Let's say that the blood is flowing in at a rate of 100 mm/min
  假设血流速度为一百毫米每分钟
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  and that the resistance here is one unit,
  阻力是一个单位
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  and the resistance here on each of these smaller segments is smaller-- or higher.
  每一小段的阻力都会更小 或者更大
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  These are smaller--
  血管变细时
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  it branches into smaller vessels so they have a higher resistance,
  当血液流入较细的血管时 阻力增大