RESEARCH INTO BORE ROUNDLESS OF THE MEDIUM AND HEAVY WALL-THICKNESS PIPES UNDER THE PROCESS OF SLIGHT STRETCH REDUCTION ON DIAMETER是什么意思_RESEARCH INTO BORE ROUNDLESS OF THE MEDIUM AND HEAVY WALL-THICKNESS PIPES UNDER THE PROCESS OF SLIGHT STRETCH REDUCTION ON DIAMETER在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句