contract in

The bodybuilders contracted their biceps in unison.

健美运动员们一起收缩肱二头肌。

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缩小。

Metals contract in cold weather.

金属遇冷气收缩。

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，染上微微的红晕，飘着红紫红紫的彩云。

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.

长期的食生食上伤痕的附生物以致部分食狭窄。