So you might imagine that the crust forms a solid, complete shell, like an eggshell around a softer inside.

所以你可以想象成地壳形成了一个坚实的完整的外壳，就像蛋壳包裹着更软的内部一样。

It's only one away from completing it's shell.

离完成它的外壳只有一步之遥。

The last thing it wants to do is give away electron, it wants an electron really, really, really, really badly so it can get to a configuration of argon, so it can complete its third shell.

它最不想做的就是放弃电子，它非常非常非常非常想要一个电子， 这样它就可以达到氩的构型， 这样它就可以完成它的第三个壳层。