Horns are usually in pairs, one on each side of the head.

角一般都是成对的，在头部两侧一边长一个。

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A steel bar used, usually in pairs, as a track for railroad cars or other wheeled vehicles.

铁轨，钢轨用作火车车厢或其它有轮车辆的轨道的钢轨，通常成对使用。

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After Turkey, people will use it to the trigeminal bone Wishing, usually in pairs right, trigeminal started at one end of bone fracture after breaking off a large part of the people to be - a wish.

吃完火鸡，人们还会用它的三叉骨来许愿，通常是两人一对，各执三叉骨的一端拉开，断裂后掰到较大部分的人便可许一个愿望。

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And people, my neighbors, are always surprised because I live on the second floor apartment, and there are usually 40 pairs of shoes in front of my gate, and people play cards inside and play chess.

CNN: Jack Ma Talkasia Transcript

Normally, an incoming electron would have a good chance of displacing one of these low-energy incumbents, but unlike the free electrons in metals, which are usually singletons, those in a superconductor tend to wander around in pairs.

ECONOMIST: Microrefrigeration