Step three in our Lewis structure rules is to figure out how many electrons we would need in order for every single atom in our molecule to have a full valence shell.

路易斯结构规则的第三步是,找出让分子中每个原子的价壳层,都排满应该需要多少个价电子。

麻省理工公开课 - 化学原理课程节选

We would predict to see a single bond between lithium, and it turns out that's what we see.

我们可以预测在锂中会看到一个单键，而实际上确实是这样的。

麻省理工公开课 - 化学原理课程节选

So it's a whole series-- when we listen to a single tone it's a whole series, and what Eva was doing there is playing out the notes in that series successively, and we'll keep banging on that.

它们是一系列的声音,我们听单频音,其实听到的是整个系列,伊娃刚才所做的就是,一个接一个奏响那个系列中的音符,关于这部分,我们会继续探讨

耶鲁公开课 - 聆听音乐课程节选

Even though we started with a single vector, which is the position vector, we're now finding out that its derivative has to be a vector and the derivative of the derivative is also a vector.

即使我们从单个矢量出发,即位移矢量,我们现在也能得出它的导数是矢量,而且导数的导数也是一个矢量

耶鲁公开课 - 基础物理课程节选

If these 8 million people , would correspond to the number of neurons in the brain, the equivalent of the hair cells that you could get out of a single cochlea would be equivalent to one person walking down 42nd street.

如果这八百万人,相当于大脑中的神经元数量的话，能从一个耳蜗内取出的毛细胞,就好比是,第42大街上的某位行人。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

In principle, we could play this with the whole class, but let's single out a particular row of the class so I'm going to come down here and I guess eventually, well I'll grab it in a minute.

理论上,我们可以全班一起做这个博弈,但我要选出特定的一行,我先走下来,我觉得,我很快就能挑到人

耶鲁公开课 - 博弈论课程节选

It turns out that we can do that now because we have an enzyme called reverse transcriptase, which is able to take single stranded messenger RNA and make DNA out of it.

我们现在已经可以做到这一点了,因为我们有了反转录酶,反转录酶可以用,单链的mRNA创造出DNA

耶鲁公开课 - 生物医学工程探索课程节选

You won't always draw out every single possibility that you have to start with.

你都可以这样做,大家并不需要每次都把所有可能的结构都写出来。

麻省理工公开课 - 化学原理课程节选

And in terms of using these equations in solving problems on the exam, and also using these constants, make sure if you think there might be any chance you're going to get any little part of a problem wrong or do a calculation inaccurately, you need to write out every single step of your thinking as you write out these problems.

而当你在考试过程中用这些公式,来解题时，加上运用这些常数，如果你觉得有可能,在某一小问上出错,或者出现计算错误，请务必把你的思路一步一步地都写出来,当你在答题的时候。

麻省理工公开课 - 化学原理课程节选