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1·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》

2·They always come in pairs.

他们总是成对地出现。

3·These birds fly in pairs.

这些鸟成双成对地飞。

4·It was a big exhibition, a big art show that they had in Pairs every year.

那是一个很大的展览，是他们每年都会在巴黎举办的一个很大的艺术展。

5·But there was a problem: transits of Venus, unlike those of Mercury, are rare, occurring in pairs roughly eight years apart every hundred or so years.

但有一个问题：和水星凌日不同的是，金星凌日是罕见的，大约每隔一百年会成对出现八年的时间。

6·Students worked in pairs on the project.

学生两人一组做这个项目。《牛津词典》

7·Even numbers, except four, are better than odd-as good things are believed to come in pairs.

偶数，除了4，都比奇数好，因为人们相信好事成双。

8·What I heard most often there was questions like Shall we do the task in pairs? and Four students each group.

在那里我最经常听到是诸如“我们将以小组形式做这个任务吗”此类的问题，和“每组四个学生”。

9·They are all sold in pairs.

他们都成对卖。

10·Students practice in pairs.

学生展示对话。