We cannot do anything about protons, they are buried in the nucleus, but we can add or subtract electrons.

我们不能改变质子，它们埋藏在原子核内，但是我们能够增加或减少电子。

麻省理工公开课 - 固态化学导论课程节选

He's saying they're doing great work but they forget this one little thing: you cannot reconcile rhetoric and grammar.

他说的是，他们做得非常好,但是他们忘记了一个小问题，修辞和语法是不可能和解的。

耶鲁公开课 - 文学理论导论课程节选

There were words in there--they said something--of course, we cannot guarantee that they won't go up in value but historically they have always done it or something like that.

他们在文中吹嘘...当然,我们不能保证金币不会升值,但金币的历史行情趋势始终向上

耶鲁公开课 - 金融市场课程节选