And so you can see the pneumonia, tuberculosis, the communicable diseases, infectious diseases, for the most part, are taking the most lives at that point.

你可以看到肺炎,肺结核,传染病,感染性疾病,是夺走大多数人生命的主要原因

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But people died typically of either infectious diseases or they died during childbirth, or they might have died at old age which would have been 50 or so at that time.

那时的人要么死于传染病,要么在分娩的过程中死去,或者在他们大约五十岁左右的时候,死于衰老

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So in a town that's the size of new Haven with a population of let's say 100,000 people in just the immediate New Haven area, there might be 20 of these instances of very severe form of polio per year, 20 crippled children would result.

在一个像纽黑文这么大的城市里,大约有十万人口,生活在纽黑文地区的人当中,每年可能就会有二十人,感染到这种急性传染病,可能会导致二十个孩子残疾

耶鲁公开课 - 生物医学工程探索课程节选