I'm glad to hear that no one counted this r equal zero as a node.

我很高兴没听到有人把ｒ等于０这处也算作是一个节点。

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

So, you can see, it's much easier to describe that as one term, r here, instead of using both y and z.

所以，你们可以看到，用r而不是y和z来做描述，使得它变得更为简单。

麻省理工公开课 - 化学原理课程节选

Force goes as one over r squared.

力和1/r^2成正比。

麻省理工公开课 - 固态化学导论课程节选

Energy goes as one over r.

能量和1/r成正比。

麻省理工公开课 - 固态化学导论课程节选