To improve its service life, need is in its bottom v a hard alloy (wolfram steel) pulverous, in order to form layer of v of roll flute form.是什么意思_To improve its service life, need is in its bottom v a hard alloy (wolfram steel) pulverous, in order to form layer of v of roll flute form.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句