And, in fact, if any electron comes in their midst, they'll capture it because the binding energy is so high.

事实上，如果电子从中间进来，它们会捕获它,因为束缚能是如此之大。

麻省理工公开课 - 固态化学导论课程节选

So, what we're going to define is just let's just capture 90% of that electron density.

所以，我们所定义的,只包括百分之九十的电子密度。

麻省理工公开课 - 化学原理课程节选