Alloy steel heats are vacuum-treated on degassing units to reduce hydrogen contact to less than two parts per million and reduce metallic oxides.是什么意思_Alloy steel heats are vacuum-treated on degassing units to reduce hydrogen contact to less than two parts per million and reduce metallic oxides.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句