So by parallel we mean - they're either both spin up remember that's our spin quantum number, that fourth quantum number.

所以我们意味着,它们都是自旋向上,记住我们的自旋量子数，是第四个量子数。

麻省理工公开课 - 化学原理课程节选

So what that means is that we're limited in any atom to having two electrons per orbital, right, because for any orbital we can either have a spin up electron, a spin down electron, or both.

这意味着在一个原子内,每个轨道上可以有两个电子，对吧，因为对任何轨道,我们可以有自旋向上或者自选向下或者两者都有。

麻省理工公开课 - 化学原理课程节选

And since we don't know the absolute up and down in the universe, it is possible that some of the electrons may be spinning up.

由于我们在宇宙里,并不知道什么是绝对的上和下，所以说上面的现象很有可能是,一些电子向上自旋引起的。

麻省理工公开课 - 固态化学导论课程节选

And that the fact that it split into two was telling them that there must be some new property to the electron, and what we call that now is either being spin up or spin down.

它能一分为二的,事实告诉我们,电子一定有某种新的性质，我们叫它自旋向上或者自旋向下。

麻省理工公开课 - 化学原理课程节选

So this one is spin-up plus a half, this is spin-down minus a half.

所以自旋向上是正二分之一，而自旋向下是负二分之一。

麻省理工公开课 - 固态化学导论课程节选

So one goes spin-up and the other goes spin-down.

所以一个是自旋向上，另一个是自旋向下。

麻省理工公开课 - 固态化学导论课程节选

I put in the first one spin-up.

首先放入一个自旋向上的。

麻省理工公开课 - 固态化学导论课程节选

Likewise with 2s, spin-up, spin-down.

s层也是这样，自旋向上，自旋向下。

麻省理工公开课 - 固态化学导论课程节选