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。

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.

youdao

日本钢铁联合会(Japan Iron and Steel Federation)总裁宗冈正二(Shoji Muneoka)说，这对我们是个问题。

'It is a problem for us,' said Japan Iron and Steel Federation Chairman Shoji Muneoka.

youdao

他正埋头写他的第二部小说。

He is now engaged on his second novel.

《牛津词典》

times 7, plus we have 6 in the sulfur, and oxygen is right above sulfur, so that also has 6.

二乘上七，加上硫的六个，而氧在硫的正上方，因此也有六个。

麻省理工公开课 - 化学原理课程节选

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

Because aluminum ions have charge of plus three and oxygen ions have charge of minus two.

因为铝离子为正三价,氧为负二价。

麻省理工公开课 - 固态化学导论课程节选