The naturalness of slavery is said to follow from the belief that inequality, inequality is the basic rule between human beings.

奴役是自然的演变据其所言,是依寻着不平等的看法，不平等是人类之间最基本的法则。

耶鲁公开课 - 政治哲学导论课程节选

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