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

The molecule is net neutral, but this right end is a little bit more negative and the left end is a little bit more positive.

这分子是电中性的，但右边要带一点负电荷,而左边要带一点正电荷。

麻省理工公开课 - 固态化学导论课程节选

It's loaded with phosphates which are negatively charged.

NA分子上有很多带负电荷的磷酸根

耶鲁公开课 - 生物医学工程探索课程节选