筷子都是成双的。

Chopsticks come in pairs.

youdao

成双的袜子是别在一起的。

Where is the pair to this sock?

youdao

地板上的鞋子都整齐成双地摆着。

All the shoes on the floor were neatly paired.

《牛津词典》

They different greatly in style. Genesis 1 is formalized, it's highly structured, it has the seven days and everything's paired up.

风格迥异，《创世纪》1，很书面化,结构严谨，什么东西都是成双成对的。

耶鲁公开课 - 旧约导论课程节选

Then we're going to actually use MO theory to describe bonding within these molecules, and we'll start with homonuclear diatomic molecules.

然后我们要利用MO理论,来描述这些分子内的成键，我们要讨论同核双原子分子。

麻省理工公开课 - 化学原理课程节选