So, today we're moving on, we're talking about Lewis structures.

那么，今天我们接着讲，继续讨论路易斯结构。

youdao

All right. So let's try one more example of drawing Lewis structures before we talk about formal charge.

好，让我们在讲形式电荷之前，再给一个例子画一下路易斯结构。

youdao

So, when we talked about Lewis structures, we actually assigned electrons to individual atoms or to individual bonds.

当我们讨论Lewis结构时，我们把每个电子指派到，各个原子或键上去。

youdao

So we'll talk specifically about drawing Lewis structures and then about formal charge and resonance, which are within Lewis structures.

因此我们会专门讲一讲,如何来画路易斯结构,然后再讨论形式电荷与共振论，它们也属于路易斯结构的范畴。

麻省理工公开课 - 化学原理课程节选

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

So he came up with the ideas that led to the idea of Lewis structures in the very early 1900's.

他就提出了这个想法,进而发展出了路易斯结构在二十世纪初。

麻省理工公开课 - 化学原理课程节选

But Mr Lewis said he believes is it is necessary to mandate such structures in building work.

BBC: Moore tornado: Thunderstorms hamper recovery