The Black Satellites have battled through some adversity to reach the final, edging South Africa in extra time in the first elimination match, and surviving a pair of exciting 3-2 games that came down to the wire in the quarter and semifinals.

VOA: standard.2009.10.15

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

to make sure that it's going to be a comfortable pair of shoes that last me a long time.

来保证这双鞋很舒服而且可以穿很久。

不需要名牌 - SpeakingMax英语口语达人

All right, so here once again is our same matrix with me and my pair, choosing actions Alpha and Beta, but this time I'm going to put numbers in here.

我们首先讨论我和我对手,选择α或β的矩阵,不过这次我们用数字来表述

耶鲁公开课 - 博弈论课程节选

At every instant, it's got a location given by the vector R; R itself is contained in a pair of numbers, x and y, and they vary with time.

在每一个瞬时,它的位置由位矢 R 给出,R 本身包含了一对坐标值 x 和 y,并且它们都随着时间的变化而变化

耶鲁公开课 - 基础物理课程节选