So we haven't gotten to molecules yet, we're just talking about single atoms or single ions, but what's nice is just talking about this very straightforward principle of atomic radius.

我们还没有开始讲分子，我们仍然只是在讨论单个原子或离子，但它的好处在于可以讨论,这个关于原子半径的非常简单直接的原理。

麻省理工公开课 - 化学原理课程节选

The cognitive structures are still there, but the on-off switch is switched to off.

认知结构仍然存在，只是开关还没有被开启。

耶鲁公开课 - 死亡课程节选