參考譯文：

Buses used to be the main means of transportation for the Chinese people. In recent years, with the number of private cars increasing, cities have been facing increasingly severe traffic problems. To encourage more people to travel by bus, many cities have been making efforts to improve bus services. Bus facilities have been continuously renovated, and bus speed has also increased dramatically. However, bus fares are still cheap. Now, in most cities, many local elderly citizens can take a bus for free.