You may have only 15, and you use every single pair instead of thinking: Why the heck do I have 3 pairs of the same shoe in different colours?

反之，你可能只有 15 双鞋，而你在穿每一双鞋的时候再也不用去想， 搞什么鬼，为什么我会有三双颜色不同样式相同的鞋？

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A single pair of beams does not, however, produce a useful image. To do that requires scanning the object beam through the target about a hundred different ways.

不过仅利用一对光束并不能得到有用的图像，还需要从大约100个不同的角度让物体光束扫描目标。

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We'd like to run a fibre out there, but it would only be a single pair, " says Scammel, adding that Sohonet was originally set up because the telcos couldn't offer the kind of niche service he does.

我们希望运营一条去那的线路，但将只是单对的光纤，”斯科梅尔说，并且补充说索霍网络最初建立就是因为电信运营商不能提供这种小众服务。

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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

The Alberta government estimates the offspring of a single pair of Norway rats can multiply to 15, 000 in one year.

WSJ: In Alberta, Citizens Smell a Rat After Long-Banned Rodents Appear

But flat sandals are nothing but bad news, says Bob Thompson, executive director for the Institute for Preventive Foot Health, who doesn't own a single pair.

CNN: Flip-flops present feet with a painful problem

Taking shifts at the pedals and the single sleeping compartment the pair made it to Miami in 111 days.

BBC: Jason Lewis: Circumnavigating the world