Used car transactions refer to the buying and selling of second-hand vehicles. Second-hand cars are legally operational motor vehicles that have been registered and certified by traffic management authorities, not yet reaching the national规定的 insurance premium standards, and are still fit for use. The second-hand car market has become extremely popular. The affordability of used cars is a hallmark, as you can get a better second-hand vehicle for the same price as a new one. "One Car, One Inspection" introduces you to the knowledge of buying and selling used cars, revealing things you may not know.