We could also figure out the formal charges, and obviously the formal charges between these two atoms, they're going to be identical, we're only dealing with oxygen atoms here.

我们还可以把形式电荷算出来，显然这两个原子的形式电荷，应该是完全相同的，我们要处理的只有氧这一种原子。

麻省理工公开课 - 化学原理课程节选

So, for instance, this would suggest to us by the way it's written that the hydrogen is attached to the nitrogen and not the oxygen.

因此，比如，这样的写法会提醒我们,这个氢原子是与氮原子成键的，而不是氧。

麻省理工公开课 - 化学原理课程节选