The improved roll chamfer cutter has fixed the chronic problem of occurrance of linear marks on the tube surface,and brought about good result and considerable economic benefit.是什么意思_The improved roll chamfer cutter has fixed the chronic problem of occurrance of linear marks on the tube surface,and brought about good result and considerable economic benefit.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句