flex[fleks]vt.弯曲(四肢), 伸缩, 折曲vi折曲, 弯曲n.电线, 松紧带v.tr.（及物动词）To bend (something pliant or elastic).使（柔韧的或有弹性的东西）弯曲To bend (a joint).屈曲（关节）To bend (a joint) repeatedly.反复屈曲（关节）To contract (a muscle, for example).收缩（如肌肉）To move by muscular control:通过肌肉调节而运动：“Sandy flexes his brow characteristically,
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