At present, their whole amount adds up to 5.0 x109 t and occupies the area of 2 .0x10 8 m2, constructing hundreds of coal gangue hills, moreover, one third of them are still burning.是什么意思_At present, their whole amount adds up to 5.0 x109 t and occupies the area of 2 .0x10 8 m2, constructing hundreds of coal gangue hills, moreover, one third of them are still burning.在线翻译_英语_读音_用法_例句