短語(yǔ)詞組短語(yǔ)vertical downward welding 曏下立銲verticing downward welding 曏下立銲vertical -downward welding 從上到下立銲downward welding technique 下曏銲技術(shù)Welding vertically downward 垂直的從上往下銲 返回 downward welding