在大多数情况下，我们只是不知道有多少英国人在国外感染了疾病。

In most cases, we just don't know how many Britons contract diseases when abroad.

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很多土著人感染了疾病而死亡。

Many aborigines died when they came into contact with diseases.

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那些感染了疾病的人们，遭受到了前所未有的痛楚。

Those who contracted the disease encountered pain like they had never known.

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In contrast today, because we have antibiotics and we have vaccines, people don't die of infectious diseases as often.

相反,在现在,因为我们有了抗生素和疫苗,死于感染性疾病的人就不像以前那么多

耶鲁公开课 - 生物医学工程探索课程节选

And there are many reasons for this, our success in eliminating infectious diseases as causes in the developed world.

还有很多原因,在发达国家我们成功地消灭了感染性疾病

耶鲁公开课 - 生物医学工程探索课程节选

That had a remarkable effect on reducing transmission of infectious diseases, in doctor's offices and hospitals.

这显著的减少了,在医生的办公室和医院内部,感染性疾病的传播

耶鲁公开课 - 生物医学工程探索课程节选