It is a free electron so there is no potential energy to be accounted for.

对于自由电子,因此没有什么势能。

麻省理工公开课 - 固态化学导论课程节选

And, in fact, it can't even reach n, because then we would have no potential energy at all in our electron, which is not correct.

事实上，它连n都达不到，因为如果那样的话,电子就没有势能了，这是不可能的。

麻省理工公开课 - 化学原理课程节选

At infinity, there's no stored potential energy, and it drops off more and more negative as one over R.

在无限远处，没有储存的势能，并且它向负方向减少，当距离超过R时。

麻省理工公开课 - 固态化学导论课程节选

States stand to one another on the world stage as individuals do in the condition of nature; that is to say, potential enemies with no higher authority by which to adjudicate their conflicts.

国家相对于世界的关系,就好比人相对于自然的关系;,也就是说,在冲突面前不会有更高的权威,来裁定谁对谁错，只能弱肉强食。

耶鲁公开课 - 政治哲学导论课程节选