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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  and you could do that by depriving the soil of organic matter and excrement.
  通过剥离土壤中的有机物和排泄物
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  So, he wanted to supply Germany with clean water.
  所以他想在德国供应洁净的水源
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  But not specifically clean drinking water,
  但不是洁净的饮用水
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  but he wanted to prevent sewage from gaining access to the
  他还想防止污水渗入
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  groundwater and the soil beneath the city.
  城市的地下水和土壤
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  He also championed the idea of sand filtration of water,
  他还支持水的砂过滤
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  to ensure clean water.
  来确保水源的洁净
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  He thought that Snow had been seriously misled.
  他认为斯诺被误导了
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  There was a matter of proportion here.
  这里有一个比例问题
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  Snow, he said, was really concentrated on the
  他说斯诺只关注了
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  few liters that a person consumed.
  人们饮用的那几升水
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  That water, he argued, no matter how contaminated,
  而佩腾科弗认为不管饮用水被如何污染