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

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

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