A carriage is a carriage. Simply put; The carriage in western countries is four-wheeled. But in China, it has been two-wheeled since ancient times. In ancient times, there was a carport. There was a small square window on both sides of the carport, about 40 cm in size. People in the car could look out. There are curtains in front and back of the carport. After liberation, the carriage was used as a tool for modern production and life.