来自《耶鲁大学开放课程：1600年后西方社会的流行病 第3集 第3集》

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  affecting whole continents,
  影响整个大洲
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  or occasionally going global.
  或者有时是全球
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  The plague struck the West in three pandemic waves.
  瘟疫以三次大流行病袭击西方
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  We'll be talking about the history, then,
  我们将谈谈这段历史
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  of three pandemics of bubonic plague.
  腺鼠疫的三次大流行的历史
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  And each pandemic as a subset, if we like,
  可以把每次大流行看做一个子集
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  had a series of recurring visitations
  每次都有一系列的又一次的天罚
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  that might even last for centuries.
  可能甚至持续了数世纪
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  And in addition to being cyclical in that sense,
  在这意义上加起来就是循环
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  plague had a pronounced seasonality.
  瘟疫有一种明确的季节性
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  An epidemic of bubonic plague
  腺鼠疫的流行病
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  usually began in the spring or summer months,
  经常在春夏时节开始