What I just spent many lectures discussing is the fact that we can not know how far away an electron is from the nucleus, so we can't actually know the radius of a certain atom.

我花了这么多课时所讨论的正是我们,不可能知道电子离原子核有多远这一事实，因此我们不可能知道某个原子的半径。

麻省理工公开课 - 化学原理课程节选

This should all sound incredibly familiar, like I'm just repeating myself in terms of photoelectric effect, because essentially that's what I'm doing, and that's one reason we spent so much time and did so many problem-set problems on the photoelectric effect.

这应该听起来极其熟悉，就像我在重复自己在讲光电效应时所说的话，因为基本上我正是在这样做，这也是我们在光电效应这个问题上,花这么多时间,做这么多习题的原因之一。

麻省理工公开课 - 化学原理课程节选

If I buy this amount of two-period bonds, how much does it cost me?

如果我买这么多两年期债券,我要花多少钱呢

耶鲁公开课 - 金融市场课程节选

That is why you paid so much money to come here.

那就是你们为什么要花这么多钱来这的原因。

麻省理工公开课 - 固态化学导论课程节选

Does anybody know why so much time is spent on that? Yes?

有谁知道为什么要在这上面花这么多时间吗,你说

耶鲁公开课 - 基础物理课程节选