They describe people buying their first homes and filling them with many things.

VOA: special.2010.03.28

So what we're doing is filling in those eight electrons following the Aufbau principle, so our first electron is 1s going to go in the 1 s, and then we have no other options for other orbitals that are at that same energy, 1s so we put the second electron in the 1 s as well.

它会是什么样子呢,我们正在做的是将这8个电子按照奥弗,堡原理进行填充,所以我们第一个电子将会进入，然后我们没有其他的,轨道的选择在同一个能级，所以我们把第二个电子也放入。

麻省理工公开课 - 化学原理课程节选

Let's look at electron filling first of all.

让我们先来看看电子填充。

麻省理工公开课 - 固态化学导论课程节选

The same thing when you're going from filling in the 2 s to putting that first electron into the 2 p.

当你填满，2，s，后再往，2，p，中,放第一个电子的时候就会发生这种问题。

麻省理工公开课 - 化学原理课程节选