场地自行车争先赛，看不懂啊

Jordan

When racing at high speed, the rider who manages to stay just behind their opponent can 'slipstream', expending less effort. They are riding through air that is being pulled along behind the 'lead out' rider, thus reducing the speed of the wind felt by the second rider. Just before the finish, the trailing rider pulls out of the slipstream, and using their fresher legs may be able to overtake their opponent just before the line. To prevent this, the leading rider may choose to accelerate quickly before the last lap, hoping to catch his opponent unaware and establish a large enough gap to negate the aerodynamic effect.