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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Why could doctors provide their services在霍乱中 -
in the midst of an epidemic of cholera医生接触病人提供治疗 -
and yet not fall ill of it themselves?为什么他们没有被感染 -
What caused the pronounced seasonality of cholera?霍乱的季节性是如何产生的 -
Why was its onset almost invariably in the spring and the summer?为什么它总是在春夏季发生 -
And why did an outbreak always seem to ebb又总是在寒冷的季节 -
with the onset of cold weather?逐渐消失 -
And then lastly, for the moment,当时最重要的 -
there was what we might call the problem of Lyon;是里昂难题 -
that is, the great second city of France.里昂是法国的第二大城市 -
If cholera is contagious, and if it follows the great如果霍乱是传染性的 -
routes of trade and population movement,并跟随着贸易和人口流动