No matter how I look at this issue, I cannot escape being troubled by the fact that we have in place a policy which forces young men and women to lie about who they are in order to defend their fellow citizens."

VOA: special.2010.02.06

And I cannot have an unpaired electron in the same orbital.

我不可能在同一个轨道,得到不成对电子。

麻省理工公开课 - 固态化学导论课程节选

And, believe it or not, I have students walk in and first thing a hand goes up and says do you have a pen? I cannot believe it.

不管信不信，我有些学生走进来，第一件事就举起手问,你有没有笔，难以置信。

麻省理工公开课 - 固态化学导论课程节选

I think what is important is that the Iraqi authorities and the Iraqi people have understood that they cannot let them [the insurgents to get away with this,".

VOA: standard.2009.09.10

If I can just have it there before me, that is a very difficult and derivative intellectual act, and it cannot be understood as primordial or primitive.

仅是面对着它，对于思维来说非常困难，并且这不能被理解为是原始的。

耶鲁公开课 - 文学理论导论课程节选

And a lot of children I have come from different cultures, actually we cannot give them more insight into another culture, because even though they go to school with one and another, they don't know that much about each other's backgrounds, where they come from, or what part of world , what language they speak at home.

很多的孩子都是来自于,不同的文化，事实上我们给不了他们,对于其他文化的更多的见解，因为即使他们和其他的,孩子一起来上学，他们并不知道,其他人的背景，他们来自哪,或者世界的那部分，他们在家说什么语言。

麻省理工公开课 - 媒体、教育、市场课程节选