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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  But the idea of lengthy and military-enforced isolation
  但实践却证明 靠军事强制执行的
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  was highly effective in practice.
  漫长隔离是行之有效的
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  Forty days
  四十天
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  exceeded the incubation period of the disease,
  远远超过了病毒的潜伏期
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  and so were sufficient to guarantee
  这样必然可以保证被释放的
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  that a person then released was medically harmless.
  人员绝对不会携带任何病毒
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  At the same time,
  同时
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  the period of quarantine was long enough to ensure
  疫检期的长度足以保证
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  the death of infected fleas,
  感染的鼠蚤与细菌
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  and of the bacterium itself.
  全部都已经死亡
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  So, an inaccurate theory
  因此 一项不精确的理论
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  produced sound administrative procedures.
  产生了一套健全的行政体系