So we can do this for any final charge we have, if we have a molecule that has a charge of plus 2, then all of the formal charges should add up to plus 2 and so on.

对于任意净电荷的情况,我们都可以这样做，比如假设我们有一个带两个正电荷的分子，那么所有的形式电荷加起来应该等于正二，等等。

麻省理工公开课 - 化学原理课程节选

One thing that I want to mention that is really important is once you have double bonds, what happens between those two atoms in the molecule is they can no longer rotate in relation to each other.

我要提醒你们的非常重要的一点事,一旦有了双键，分子中的两个原子,就不能相对旋转了。

麻省理工公开课 - 化学原理课程节选

And, let's try one with two different atoms.

让我们试试有两个不同原子的分子。

麻省理工公开课 - 固态化学导论课程节选

We can also talk about atoms that have two or more central atoms.

我们也可以讨论,有两个或者更多中心原子的分子。

麻省理工公开课 - 化学原理课程节选