So, let's make sure everyone kind of has this down, let's do another clicker question here.

好，让我们确保每个人都记下了这点，来做下一个选择题吧。

麻省理工公开课 - 化学原理课程节选

So, let's do a clicker question on isoelectronic atoms.

那么，让我们来做一个关于等电子原子的选择题吧。

麻省理工公开课 - 化学原理课程节选