T wenty three years ago, my mom died , and this man was left all lone to raise a four teen years old girl and eleven years old boy. He suddenly had to be mom and dad.

23年前，我的母亲去世了，抛下父亲一人抚养起一个14岁的女孩和一个11岁的男孩，他一下子扮起了既当爹又当妈的角色。

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And one of the reasons that's most responsible for that is that humans aren't dying at as young an age from infectious diseases as they did three or four hundred years ago.

最重要的一个原因就是,人们不会在年轻的时候死于传染性疾病,而这在三四百年前确实会发生

耶鲁公开课 - 生物医学工程探索课程节选

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