So if you have some region of space S and you call its boundary surface S and you let n be the normal vector that goes out of the region R.

如果存在一些区域空间,边界为曲面,定义n为指向区域R外的法向量。

youdao

And so, what we're trying to let them know is that we want to have a successful U. S. auto industry. We think we can have a successful u.

我们希望这些公司知道，我们确实想看到美国汽车工业的繁荣，而且这也是完全可能的。

youdao

Grandpa: Oh, it's so good to see you. Du Du, I have a present for you. Let 's go.

外公：见到你们真好。都都，我带了礼物给你。我们走吧。

youdao

"And so, what we're trying to let them know is that we want to have a successful U.S.auto industry.

VOA: standard.2009.03.30

So let's have a clicker question here on how many total pi bonds do you expect to see in benzene?

让我们来做个课堂习题,你们觉得苯环里有一共多少个π键？

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

He's the one under pressure, I've got nothing to lose, so let's have a go from here.

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So let's have that conversation.

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So let's not have that argument either.

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