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2011年电子竞赛蓝牙控制智能小车程序，正常行驶以及超车-2011, the Bluetooth control intelligent electronic race car program, and overtaking the normal driving

A phase difference is analogous to two athletes running around a race track at the same speed and direction but starting at different positions on the track. They pass a point at different instants in time. But the time difference (phase difference)