American cities have many nickenames, such as Chicago is the windy city and Los Angeles is the city of angels. The biggest city New York is famous for the nickname of The Big Apple.
University campus should be clean and quiet for students to learn knowledge. Students also need a safe environment. So it is not good to open the university for tourists.
I hope every tourist who goes abroad should understand that he/she is on behalf of our country. We have the responsibility to defend the dignity of our country. We should show the world the best of Ch