For straight seams, we use submerged arc welding or carbon dioxide welding; for some corners and small areas, we still use manual welding.是什么意思_For straight seams, we use submerged arc welding or carbon dioxide welding; for some corners and small areas, we still use manual welding.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句