Upstream throttling and downstream throttling

For us, the car is an indispensable means of transportation in our daily life. Its many advantages deeply attract us. For example, cars are free, convenient and comfortable to drive, which enables us to reach our destination quickly and conveniently. However, besides enjoying the convenience brought by cars, we should learn more about cars. So today, we will introduce the relevant contents of the car by repairing the car, help everyone better understand and use the car, and make our journey smoother.