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 頂桿後坐forward and backward movement 正反曏運行backward and return movement 前後運動forward and backward movement knob 載物臺前後運動螺鏇backward movement of the truck 卡車的倒車 返回 backward movement