"We don't want to come here two years later, three years later,or four year later to again talk about the extremism,terrorism, drugs,and so on and so forth,".

VOA: standard.2009.03.27

I'm three years old. Maybe I don't know what "pulls up" means.

我三岁，可能我不知道“停下来“是什么意思。

耶鲁公开课 - 文学理论导论课程节选

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

I started talking about what happened in October 1987 and I looked around the room and I realized that I think the students were three or four years old in 1987 and weren't yet reading The Wall Street Journal.

当我提到1987年10月所发生的事,我环顾整个教室,意识到,1987年在座各位可能只有三四岁,还没有读过那时的《华尔街日报》

耶鲁公开课 - 金融市场课程节选