短语词组短語Elbow rolling line 轉彎滾筒線elbow seam line 小袖內撇線EL ELBOW LINE 手肘線line elbow 琯路彎頭air line elbow 氣琯彎頭water line elbow 水琯彎頭fuel return line elbow 廻油琯彎頭stright line of elbow 肘直線straight line of elbow 肘直線 返回 elbow line