If you try to imagine a smile with no body at all, it can't be done. Why?

如果你要相信一个没有身体的微笑,那是根本做不到的 为什么呢

耶鲁公开课 - 死亡课程节选

How do we know this always stops? I mean, I ran three trials here, and it did. But how would I reason about, does this always stop?

我指的是我在这儿试了三次，它都停了，那这是为什么呢？,它总是会停下么？

麻省理工公开课 - 计算机科学及编程导论课程节选

Comedy Oh the Comedy Francaises And it's not natural ? Then why should it be natural?

法国喜剧,的确，是法国喜剧,并且那是不自然的,那么为什么它应该显得不自然呢？

麻省理工公开课 - 电影哲学课程节选

So why is temperature, for example, such an important thing to control?

那为什么体温是如此重要的调控指标呢

耶鲁公开课 - 生物医学工程探索课程节选