We also need to follow Hund's rule, this is that a single electron enters each state before it enters a second state.

我们也需要遵从洪德规则，这是一个电子在进入第二个态之前,要进入每一个态。

麻省理工公开课 - 化学原理课程节选

Good. To rule out the second slice, I need to be rational myself, and I need to know that others are rational.

要剔除46到67的数,不仅首先自己要是理性的,而且也要知道别人也是理性的

耶鲁公开课 - 博弈论课程节选