Market demand--the engine for development of seamless steel tube technology--Commemorating the 120th anniversary of invention of the rotary piercing process by Mannesmann Brothers是什么意思_Market demand--the engine for development of seamless steel tube technology--Commemorating the 120th anniversary of invention of the rotary piercing process by Mannesmann Brothers在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句