A covalent bond is any time we have a pair of electrons that is shared between two different atoms.

所谓共价键就是我们有两个原子,共用一对电子。

麻省理工公开课 - 化学原理课程节选

OK, so what have I done? I just added a little bit more now. I'm now running through a pair of loops. Again notice the encapsulation, that nice abstraction going on, which is what I want. Once I get to this stage though by the way, there might be more than one solution.

我现在运行了一对循环,再一次注意这个封装,抽象得很好，这就是我想要的结果,我按这种方式走到这一步的时候,可能会有多组答案。

麻省理工公开课 - 计算机科学及编程导论课程节选

And what we have left here is the sulfur, which will also get a pair.

剩下的是硫，它也应该得到一对。

麻省理工公开课 - 化学原理课程节选

So, when you go to two dimensions, you need a pair of numbers.

因此在二维空间里,你需要一对数字来描述

耶鲁公开课 - 基础物理课程节选

The green block is gonna become a pair of parentheses.

只需要把绿色版块换成一对圆括号就可以了。

哈佛公开课 - 计算机科学课程节选

A little while ago there was a sniper, actually a pair of snipers killing people in Washington and the one thing everybody knew about it was there was a white van involved.

几年前出现了一个狙击手，确切地说，是一对狙手在华盛顿作案,大家都知道的一件事是,作案过程中有一辆白色小货车。

耶鲁公开课 - 心理学导论课程节选

If somehow you could take your anti-sense molecules that you've made and you could get them into cells, then by this process of hybridization they would naturally form a pair like this.

如果你能得到合成的反义链,并能使它进入细胞,那么通过杂交,它们就能自然形成这样的一对

耶鲁公开课 - 生物医学工程探索课程节选

So it looks a lot less messy if we just draw our Lewis structure like this for h c n, where we have h bonded to c triple bonded to n, and then a lone pair on the nitrogen there.

这看起来整洁了不少,如果我们把氰化氢的路易斯结构画成这样的话，这样我们就有氢与碳之间的单键和碳与氮之间三键，然后还有一对孤对电子在氮这里。

麻省理工公开课 - 化学原理课程节选

So, a pair or collection of those two values.

因此一对或者一系列的两组值。

麻省理工公开课 - 计算机科学及编程导论课程节选

Initial velocity is a pair of numbers.

初速度也是一对数字

耶鲁公开课 - 基础物理课程节选

That expression, or that value, or that value, literally gets passed back out of that local environment to the value that comes back out of it. So in particular, none none what's solved returns is a pair.

这个表达或者说值，实际上是从那个局部环境中,输出来付给它的,所以solved返回的是一对值，它可以是一对。

麻省理工公开课 - 计算机科学及编程导论课程节选

Initial position is a pair of numbers.

初始位置是一对数字

耶鲁公开课 - 基础物理课程节选

If it isn't, then I'm going to go back around the loop, and notice what happens. If I get all the way around the loop, that is, all the way through that FOR loop and I never find a path that takes me through here, then the last thing I'm going to do is return a pair or a tuple with a special simple number none twice.

如果没有,我会回到循环看看发生了什么,如果我运行了整个循环,也就是整个for循环,我仍没有找到符合条件的路径,那么我最后做的事情就是返回一对,或者一个数组的两次none值。

麻省理工公开课 - 计算机科学及编程导论课程节选