Teacher Laura Peterson says kids today are more used to structured play, where they have to follow rules, listen to a coach, or play on specific equipment.

VOA: standard.2010.06.25

And when we follow the Aufbau principle, we have to follow two other rules.

当我们遵从奥弗堡原理时，我们还需遵从两个其他的规则。

麻省理工公开课 - 化学原理课程节选