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

and they bought every single one of these guests a pair of new shoes for a party favor.

而且他们给每个参加聚会的人买了一双新鞋。

富家孩子的生日 - SpeakingMax英语口语达人

Why don't we give Philip both the matching pair and give you each a pair of socks since he didn't get to wear this one, they are brand new, in fact, and a big round of applause for what I'm sure is a little difficult.

我们为什么不给飞利浦一双配对的袜子,给你们每人一双袜子,他还没穿这双袜子，所以这双还算是全新的，再次以热烈的掌声对他们表示感谢,这样的模仿还是有一些难度的。

哈佛公开课 - 计算机科学课程节选

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

And the motivation for choosing a pair like that is easy to see, if we look at our condition for spontaneous change or general condition.

我们这样选择的动机,很明显，如果考察我们所考虑的自发变化的条件,或者更一般的条件。

麻省理工公开课 - 热力学与动力学课程节选

You can't compare a pair of shoes with the child's life."

你不能拿一双鞋子和一个小孩的生命比较“

普林斯顿公开课 - 人性课程节选

I'll mention,just in passing, that these thought experiments that I'm about to give, Bernard Williams I'm going to give a pair of them,come from Bernard Williams, who's a British philosopher.

顺便一提，我即将做的两个思考实验，是源于，一位英国哲学家。

耶鲁公开课 - 死亡课程节选

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

For instance, if I am buying a pair of shoes,

比如说，如果我想买一双鞋，

不需要名牌 - SpeakingMax英语口语达人

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

As you would say, it's like pair of skinny jeans, a pair of brogues, I don't know, a T-shirt,

这打扮就是一条紧身牛仔裤，一双皮鞋，大概还有一件T恤，

街头时尚的精髓 - SpeakingMax英语口语达人

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

What you used to do is, every six months you'd pull out your bonds and you'd clip the coupons with a pair of scissors; you take them to a bank and they would give you cash for your coupons.

过去,你每六个月从你的债券上,用剪刀剪下息票,把它拿到银行,用息票兑换现金

耶鲁公开课 - 金融市场课程节选

For the carbon, we start with 4 valence electrons, we have 0 lone pair electrons minus 4, and we end up with a formal charge of 0.

对于碳，我们从四个价电子开始，我们有零个孤对电子，再减去四，最终我们有零个形式电荷。

麻省理工公开课 - 化学原理课程节选

So, I've got ion pair formation, and I've got a huge decrease in energy because a donor is able to express that urge, an acceptor is able to express that urge.

所以我能得到形成的电子对，同时能量也大幅下降,因为失电子方要表达它的迫切，得电子方也要表达它的迫切。

麻省理工公开课 - 固态化学导论课程节选

Mrs. Watts was sitting alone in a white iron bed cutting her toenails with a large pair of scissors.

Watts太太独自坐在,一张白色的铁床上,用一把很大的剪刀,剪自己的脚趾甲。

耶鲁公开课 - 1945年后的美国小说课程节选