My heel slips out of my running shoe with every pair I buy.

我的脚后跟总是从我买的每一双跑鞋里滑出来。

youdao

They carry on the tradition of giving back for every pair of socks sold, they give away a pair to those in need.

他们还继续着这一传统，每卖出一双袜子，就会向有需要的人赠送一双。

youdao

For every pair of components the mixed partials must be the same.

对于任意两分量，混合偏导数相等。

youdao

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

Los Angeles-based TOMS shoes fulfills its commitments by donating a pair of shoes to the underprivileged for every pair a paying customer buys.

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Mr. MINTZER: You'll find them in virtually every pair of ear buds attached to a teenager in the United States that allow iPods to walk down our streets.

NPR: Trading Foreign Oil For Foreign Electric Car Parts?

That direct-from-manufacturer model allows the Warby crew to keep costs down and donate one pair of glasses to someone in need for every pair that it sells.

FORBES: The New Model for Retail: Buying Eyeglasses Online