来自《耶鲁大学开放课程：1600年后西方社会的流行病 第4集 第4集》

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  and people were able to skate on them.
  人们甚至可以在上面溜冰
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  And there were many other examples of winter scenes of painting.
  还有很多描绘冬日风情的绘画例子
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  This was how cold it was in the seventeenth century.
  这就说明十七世纪有多冷
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  Indeed, it swept all of Europe.
  事实上 寒潮横扫欧洲
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  The River Thames froze in London.
  伦敦的泰晤士河冻住了
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  The Baltic froze, so that one could travel
  连波罗的海都被冰封 所以人们可以
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  by sled from Poland to Sweden.
  从波兰一路坐雪橇到瑞典
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  And these weren't good conditions for Yersinia pestis,
  这些对耶尔森氏菌属的黑死病可不是好消息
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  and the fleas that were its vectors.
  作为传播媒介的跳蚤也受不了这样的温度
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  But we've run out of time.
  不过 今天的时间来不及了
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  But at least we've contained the plague.
  但至少我们控制了黑死病
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  And next time we'll look at its impact.
  下节课我们再来看看它的影响吧