明早在其他人来之前先到这里，我们来练习一下。

Come in early tomorrow morning, before the others get here and we'll practise.

youdao

那么现在我们已经做了足够多的画路易斯结构的练习，让我们来讨论一下如何得出形式电荷。

So now that we have enough practice drawing Lewis structures let's talk about actually figuring out this formal charge.

youdao

让我们来做一下练习2的第1题，该选择哪一个?。

Let's look at Excersie 2. Number1, which one to choose?

youdao

So now that we have enough practice drawing Lewis structures let's talk about actually figuring out this formal charge.

那么现在我们已经做了足够多的画路易斯结构的练习,让我们来讨论一下如何得出形式电荷。

麻省理工公开课 - 化学原理课程节选