保护我们的城市(Saving Our City)

网友回答：

our city has started to face the problem. some rubbish is sorted and sent to a certain place .waste gas is cleaned before it goes into the air. waste water is also cleaned before it is poured into rivers. 保护我们的城市(saving our city)

温馨提醒：随时光变迁，文中所陈述观点；准确性、难免有所变动，因此文中观点仅供参考。