Many drivers have experienced the "black" experience of repairing cars. Apart from a lot of money damaged in their bags, valuable time is always on the repair car. Therefore, the author visited some old drivers who were experienced in using cars and repairing cars, and summed up the magic trick of saving money and saving time. Elementary knowledge of cars should have been repaired for a long time. Like a brake light bulb, such parts are loss products, even a new car can not be damaged, so as long as you carefully study the simple structure of the car taillight, you can buy the right light bulb, and then change yourself to the car, which saves the pain of the queue and increases the emotional communication between the car and the car. It means to kill two birds with one stone.