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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  as we'll see, made the idea
  我们将会了解到
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  of dyscrasia improbable as a mechanism
  平衡体液不调的机制
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  needed to explain epidemic disease,
  用来解释流行病非常合适
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  because it's fairly flimsy
  因为这个机制非常脆弱
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  as a basis for explaining why so many people,
  这也就解释了为什么许多人
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  in a single place, at a single moment of time,
  在某个地方某个时间
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  had their equilibria all unbalanced at the same moment.
  同时发生了失衡
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  So, the experience of epidemic disease is important,
  所以流行病的发展是很重要的
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  and we'll see the physician,
  我们也会了解
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  Fracastoro, came up with the idea
  内科医生弗拉卡斯托罗几个世纪前
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  of contagionism many centuries ago.
  提出了传染说
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  In the nineteenth century we'll see also,
  我们还要了解在十九世纪