And, as I reminded you at the end of last day, the only reason I am doing this for you right now is I want to elucidate the principles.

就像我上次课的最后跟你们说过的那样，我现在给你们讲这些,仅仅是我想把原理阐释清楚。

麻省理工公开课 - 固态化学导论课程节选

So there are two electron configurations in the n equals one shell, if we follow according to the selection rules that we spelled out last day.

如果根据上次课,我们阐明的原子光谱选择定则，我们就会知道在n等于1的那一层,有两种电子图像构型。

麻省理工公开课 - 固态化学导论课程节选