短语词组短语bend over back 极力bend -back 反曲forearms bend at back 背臂后屈bend back All 折弯回去全部bend back a finger 反指关节bend back and forth 来回弯曲Back Bend 背部弯曲;桥形〔向后弯腰至头着地的杂技动作bend one 's back 弯腰 返回 bend back