But we cannot find it. What do you advise me to do?"

VOA: special.2009.12.26

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

And just to give you a sense, if you do a cross-cut of this, you cannot show it from this angle, but it should really be sort of a dumbbell shape with the nodal plane in between the two nuclei.

告诉你们这些就是给你们点概念，假如你们把他横切切开，不能从角度上展示，但它还是会保留几分哑铃的形态,以及在两核之间的节面。

麻省理工公开课 - 固态化学导论课程节选

But the different parts of our country cannot do this.

VOA: special.2009.07.30

"And while we will continue to do everything we can, we cannot be sure what the future will hold, but we are doing our absolute level best."

VOA: standard.2009.07.29

"Job creation in the United States is something that small businesses, entrepreneurs and the private sector will do but they cannot do it if they are burdened by a legacy of debt and the prospect of higher taxes to pay off that debt and that is the most troubling aspect of the policies this administration is pursuing,".

VOA: standard.2009.12.05