And the last thing we do for any of our structures to check them and figure out are these valid or not valid, are these good Lewis structures is to check the formal charge.

而为了检验任何一个结构是否有效,看它们是不是好的路易斯结构,我们要做的最后一件事就是检查形式电荷。

麻省理工公开课 - 化学原理课程节选

So the first thing we're going to do today is look at a different form of competition which is called Bertrand competition.

所以今天我们要做的第一件事,就是来学习一个不同形式的竞争,叫伯川德竞争

耶鲁公开课 - 博弈论课程节选

The other thing is that we can re-write our h c n in terms of bonds.

还有一件事是我们可以用键的形式来表示氰化氢。

麻省理工公开课 - 化学原理课程节选

We're interested only really in two things: One, can you differentiate between duple and triple meter; and two, can you recognize some very basic rhythmic patterns?

我们这里只关注两件事,一,你能不能区分两拍子和三拍子,二,你能不能识别一些简单的基本节奏形式

耶鲁公开课 - 聆听音乐课程节选