They marched out singly or in pairs.

他们一个一个地或成双成对地走出去。

《柯林斯英汉双解大词典》

They always come in pairs.

他们总是成对地出现。

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Students worked in pairs on the project.

学生两人一组做这个项目。

《牛津词典》

The Smithsonian's National Museum of American History in Washington,D.C., has one of the oldest known pairs of Levi's jeans in its collection.

VOA: special.2009.12.18

And then it says, OK, distribute the remaining electrons in pairs so that each atom has eight.

然后它说，接下来将剩下的电子成对排布,使每个原子都有8个电子。

麻省理工公开课 - 固态化学导论课程节选

And even here at the law school, we wrote papers in pairs and as groups.

就算在法学院，我们也是成对和分组写论文的。

在模拟审判课堂 - SpeakingMax英语口语达人

Those tyrannised by the need, the obligation, to go about this world in pairs.

BBC: Viewpoint: Why are couples so mean to single people?

Cars are lined up in pairs, bumper to bumper, coated with a week-old layer of dust.

NEWYORKER: Baptizing the Gun

This is reminiscent of their behaviour in conventional superconductors, where they wander around in pairs.

ECONOMIST: Magnetism