短語詞組短語Prevention backward movement infection 防止逆行感染Prohibited backward movement 禁止逆行backward movement of poppet 頂桿后坐forward and backward movement 正反向運行backward and return movement 前后運動forward and backward movement knob 載物臺前后運動螺旋backward movement of the truck 卡車的倒車 返回 backward movement