The repair method of the rear door depression is: 1, blow the hair dryer on the hot windshield and blow it at the depressed part with the tuyere; 2. Immediately after the blower blows, cover the dent with the prepared aluminum foil; 3. Put dry ice on the aluminum foil; After a while, I heard the sound of metal, which indicated that the dent was recovering. The opening modes of automobile doors are: 1. Front door opening: it can still be closed by the pressure of airflow when driving, which is safer and convenient for the driver to observe backwards when reversing; 2. Reverse door opening: If the door is not closed when driving, it may be washed away by the oncoming airflow; 3. Horizontal movable door: when the distance between the side wall of the car body and the obstacle is small, it can still be fully opened.