Looking at rising and setting star pairs is a good technique.

观察上升和下降的星对是一个很好的技巧。

youdao

Which of the following pairs is the odd one out?

以下那一个组合是不对的？

youdao

This approach involving private and public key pairs is also known as public key cryptography.

这种涉及到私钥和公钥对的方式也被称作公钥密码术。

youdao

Well, we're talking about a pretty high number here, so to make counting easier, we'll just say 10 lone pairs, because 20 lone pair electrons is the same thing as 10 lone pairs.

好吧，我们这里讨论的是一个挺大的数，为了数起来更容易，我们就说有十对孤对电子，因为二十个跟十对是一个意思。

麻省理工公开课 - 化学原理课程节选

And step seven is how many electrons do we have left over that are going to go into lone pairs? How many?

而第七步是我们剩下,多少电子成为孤对电子？多少？

麻省理工公开课 - 化学原理课程节选

The question is can I show you, from an energetic standpoint, that the crystal is favored over having the discrete set of pairs?

我展示你的问题是，从能量的观点出发，晶体倾向于,形成分散的一系列的对？

麻省理工公开课 - 固态化学导论课程节选

Why there are only two base pairs is an open question, and one which evolutionary biologists and geneticists want to answer.

ECONOMIST: A new kind of DNA

And some parts, particularly those where the same short pattern of base pairs is repeated over and over again, remain difficult to sequence well.

ECONOMIST: A new prize for the genomics of the elderly is now on offer

On the other hand, the majors' strengthening of the hub-and-spoke networks (by which travelers go from A to B via a hub in airport C) imply that entry into new markets -- what in the industry is called "city-pairs" -- is relatively simple.

CNN: Why American-US Airways deal is good