Nobody, of course, knew this man but they knew people who might know people who would know this man.

当然这些人都不认识他，但他们认识其他人,这些人可能认识其他认识他的人。

耶鲁公开课 - 心理学导论课程节选

Why would anyone ever risk one's life for ? one's country or a cause just to help other people, people that we don't know and probably will never know?

为什么人人都要为自己的国家或者,去救人的缘由而冒险，并且这个人我们不认识,可能永远也不会认识？

耶鲁公开课 - 政治哲学导论课程节选

Now if you think around to the people you know, you probably are aware that there are pretty important differences between people and how much they eat, and then how well those calories get banked.

现在如果想想周围你认识的人,你可能意识到,个人的进食量,以及储存能量的能力之间,存在相当大的差异

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选