来自《耶鲁大学开放课程：1600年后西方社会的流行病 第13集 第13集》

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  But to Pettenkofer, there seemed no means of
  但对佩腾科弗来说
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  explaining exactly what was transmitted, or how.
  没有找到一个确切的传染物质或传播途径
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  Also, as you know, Pettenkofer had been trained as
  另外 大家知道佩腾科弗是一个化学家
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  a chemist, and he looked at the traditional idea
  因此他从传统角度看待这个问题
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  that the cholera poison was some sort of
  也就是霍乱是某种化学毒物
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  chemical substance, and he argued that it was entirely improbable
  他以此为假设
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  that a disease could be spread then in the manner postulated.
  认为疾病不可能具有传染性
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  Looking at London and the River Thames, how could a poison
  大家想想伦敦和泰晤士河
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  contaminating the Thames, if it was a chemical,
  化学物质怎么可能污染整条泰晤士河
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  not be infinitely diluted?
  而不被稀释呢
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  Furthermore, he said there was a whole
  此外 他还认为
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  series of what we might call cholera mysteries that Snow's
  一系列的霍乱谜题是