来自《耶鲁大学开放课程：1600年后西方社会的流行病 第7集 第7集》

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  Smallpox was both endemic year in and year out in Europe,
  在欧洲 天花年复一年地爆发为地方病
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  and it was also epidemic sporadically
  同时又每隔几代人
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  every generation or so.
  偶发为流行病
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  It thrived in crowded urban environments,
  天花在拥挤的城市中兴起
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  with throngs of people, and poorly vented houses and workshops.
  肆虐于人群 通风差的房屋及工坊
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  Now, in the eighteenth century, statistics are elusive.
  在十八世纪时 统计学尚不完备
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  But smallpox is commonly thought--
  但大都普遍认为天花致死人口
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  and this is just a guesstimate--
  大约占欧洲本世纪总死亡人口的十分之一
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  to have caused perhaps a tenth of all deaths in the century in Europe,
  占十岁以下儿童死亡数的三分之一
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  and a third of all deaths among children under ten-years-of-age.
  而这仅仅只是大概估计的数目
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  Half the population of the continent
  据估计 被这种病留下疤痕或毁容的人
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  is estimated to have been scarred or disfigured by this disease.
  占整个大陆总人口的一半