柯林斯词典extensor /ɪkˈstɛnsə, -sɔː/ 1. N any muscle that stretches or extends an arm, leg, or other bodily part 伸肌→compare flexor 返回 extensor剑桥词典a muscle that moves an arm , leg , or other body part into a straight position from a bent one 伸肌 返回 extensor