Good ... As Shanghai is an international metropolis and the central city of China's economic development, many large domestic and foreign enterprises have been based in Shanghai for many years ... At the same time, more and more people come to places where there are many workers in Shanghai, the air is getting hotter and hotter, and more and more people become clouds in the air, which makes urban traffic face great pressure. Gradually, the roads become longer and wider, there are more and more cars on the roads, and more and more exhaust gas is emitted, which makes there are many polluted gases in the atmosphere. It is lighter than oxygen, rises to the ground and condenses into clouds, blocking stars at night, and so is industrial waste gas ... so that Shanghai can't see stars at night. If you go to the suburbs, mountains or rural areas, you can see stars at night. As long as there is less air pollution, you will see more stars. What I want to say is that Shanghai has taken measures to limit air pollution in recent years. In recent years, stars can also be seen at night, but if not many, the cloud pressure may be too low. ....