来自《耶鲁大学开放课程：1600年后西方社会的流行病 第12集 第12集》

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  is there an effective therapy or means of prevention,
  是否存在有效的治疗方法或预防措施
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  or instead does a society experience
  或者说 社会大众是否
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  the disease in feeling itself to be helpless,
  无力应对这种疾病
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  and physicians feeling the same?
  甚至连医生也无能为力
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  The case fatality rate is we could call it the kill rate of a disease,
  病死率是指疾病的杀伤率
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  the percentage of cases that terminate in death.
  也就是死亡病例占患病总数的百分比
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  And we know that, for example, in dealing with plague,
  比如 我们知道
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  one of the features of it--
  鼠疫和亚细亚霍乱的特点之一
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  and Asiatic cholera as well-- was a very high case fatality rate,
  就是高病死率
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  of plague, fifty to eighty percent,
  鼠疫50%到80%
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  cholera, something like fifty percent.
  霍乱则大概在50%左右
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  At the other extreme, when we come to it,
  相反 我们以后会讲到的流感