One of the other things that happened during the twentieth century is that human life expectancy increased dramatically, people started living a lot longer.

在二十世纪发生的另一大变化是,人类的寿命预期显著增长了,人们活的更久了

耶鲁公开课 - 生物医学工程探索课程节选

So one of the reasons there is a huge increase in life span is because people aren't dying of things that they would have in prior years.

寿命范围显著增长的一个原因是,人们不再死于,以前那些致死的东西

耶鲁公开课 - 生物医学工程探索课程节选

The expected life spans increased dramatically in the last couple of hundred years until now, for people that were born when you were born you can expect to live to be 80 years old, a doubling in life span, fairly dramatic.

从几百年前到现在,预期寿命显著增长了,你们同期出生的那批人,能够活到八十岁,预期寿命增长了一倍,令人印象深刻

耶鲁公开课 - 生物医学工程探索课程节选