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.

作为对光线作出反应，眼睛瞳孔会放大或缩小。

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空，染上微微红晕，飘着红紫红紫彩云。

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.

长期食管炎产食管上伤痕物以致部分食管狭窄。