contract in

The bodybuilders contracted their biceps in unison.

健美运动员们一起二头肌。

The pupil of the eye dilates and contracts in response to light.

作为对光线作出的反应，眼睛的瞳孔会放大或小。

Metals contract in cold weather.

金属遇冷气。

Eastern colored a little bit Fanzhaoyudu the sky, contracted slightly in Hong Yun, Piaozhe Purpurin Purpurin the Choi Wan.

东方一点儿一点儿泛着鱼肚色的空，染上微微的晕，飘着的彩云。

Long-standing oesophagitis may be complicated by the formation of scar tissue that contracts and results in a narrowing (stricture) in the affected part of the oesophagus.

长期的食管炎产生食管上伤痕的附生物以致部分食管狭窄。