The result shows that after the deep cooling treatment thehardness,the strength and the toughness of 20 steel carburized are increased.是什么意思_The result shows that after the deep cooling treatment thehardness,the strength and the toughness of 20 steel carburized are increased.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句