片语
backward and return movement前后运动
Prohibited backward movement禁止逆行
countermovement反向运动
adverse movement反向运动
forward and backward movement knob载物台前后运动螺旋
forward and backward movement正反向运行
backward movement of poppet顶桿后坐
backward movement of the truck卡车的倒车
Prevention backward movement infection防止逆行感染