Na 2O content in red mud is about 1/4 of that produced by Bayer Process. The dosage and pollution to environment of Na 2O are decreased.是什么意思_Na 2O content in red mud is about 1/4 of that produced by Bayer Process. The dosage and pollution to environment of Na 2O are decreased.在线翻译_英语_读音_用法_例句