短語詞組短語Elbow rolling line 轉(zhuǎn)彎滾筒線elbow seam line 小袖內(nèi)撇線EL ELBOW LINE 手肘線line elbow 管路彎頭air line elbow 氣管彎頭water line elbow 水管彎頭fuel return line elbow 回油管彎頭stright line of elbow 肘直線straight line of elbow 肘直線 返回 elbow line