Current location - Plastic Surgery and Aesthetics Network - Wedding planning company - There will be a knock at the door in the last 2 seconds of the BMW advertisement. Why?
There will be a knock at the door in the last 2 seconds of the BMW advertisement. Why?
Just to highlight BMW's sense of sports.

When racing, drivers will downshift to refuel. At this time, if the fuel in the engine is not completely burned, it will be discharged into the exhaust pipe. If backfire, it will cause deflagration and make a knocking sound. When watching a car race, I sometimes see the exhaust pipe spray twice. This is the case.