We've seen so far that we can have a neutral plus neutral sodium plus chlorine goes to cation plus anion.

到目前为止,我们得到了一个不带电的加一个不带电的,即钠加上氯，得到阳离子加阴离子。

麻省理工公开课 - 固态化学导论课程节选

I think I had managed to get to this point here where I show what happens when the cation, here sodium, is in contact with the anion here, chlorine.

我想我能回到这儿,当阳离子，在这里是钠，和阴离子，氯离子接触会发生什么。

麻省理工公开课 - 固态化学导论课程节选

Cation is plus one, anion is minus one.

阳离子带正电荷，阴离子带负电荷。

麻省理工公开课 - 固态化学导论课程节选

e The charge on the anion times minus e, so there is the minus e squared, 0R0 and divided by 4 pi epsilon zero r naught, because now I am evaluating this function at r naught, one minus one over n where n is the Born exponent.

阴离子的电荷乘以，因此会有-e的频繁，除以4πε,因为现在我用r圈评估这个函数，1-1/n，n是波恩指数。

麻省理工公开课 - 固态化学导论课程节选