“收紧”的英语？

我被要求伸展手臂，收紧胸肌。I was required to hold out my arms and flex my pectorals.那位裁缝在衣服的腰部打褶收紧.The dressmaker gathered the cloth to the narrowest part of the waist.收紧肌肉,然后起跳.Gather up your muscles and jump....

“收紧”的反义词：放宽, 紧缩。...

“收紧”的拼音为：shōu jǐn...