来自《耶鲁大学开放课程：1600年后西方社会的流行病 第2集 第2集》

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  or from one person to another--
  或者不同人之间
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  the balance among the four humors can change.
  都存在四种体液的微小变动
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  But once you cross a certain threshold in variation-
  但是一旦当你的变动跨越了那个临界值
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  that is, one humor becomes overly dominant,
  也就是说 某一种体液占据了主导地位
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  or one humor is lacking in sufficient supply-- that's an imbalance.
  或者某种体液大量不足 平衡就被破坏
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  That's dyscrasia; an excess or deficiency of one of the humors,
  导致体液不调 即体液的过量或不足
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  and that is disease.
  从而导致疾病
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  So, we know what disease is then.
  现在我们知道了疾病是什么
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  It's an imbalance of the humors.
  也就是体液的不平衡
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  Note that there is no single--
  要注意没有单个的
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  that is to say there aren't discrete individual diseases,
  也就是在现代医学中
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  as in modern medicine;
  没有单独的疾病