汽车在使用过程中由于磨损、老化等原因其性能随着行驶里程的增加而逐渐下降，到了一定期限就应报废，如果把汽车的使用寿命无限期地延长，不断地对车辆维修，用很高的代价来维持车辆运行，必然会出现车况下降，小修频率上升，致使维修费用急剧增加，燃料消耗增加，最终车辆的 Due to wear, aging, and other reasons, the car’s performance gradually decreases with the increase of driving mileage, and it should be scrapped if it reaches a certain period. If the service life of the car is extended indefinitely, the vehicle maintenance will be constantly high. The cost of maintaining the vehicle’s operation will inevitably result in a decline in the vehicle condition and an increase in the frequency of minor repairs, resulting in a sharp increase in maintenance costs and an increase in fuel consumption.