中文说明：
狗追人程序，狗从原点以一定速度起泡，速度方向始终指向人，任意一定速度作圆周运动。
English Description：
Dog chasing procedure, the dog bubbles at a certain speed from the origin, the direction of speed always points to people, and makes circular motion at any certain speed
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中文说明：
狗追人程序，狗从原点以一定速度起泡，速度方向始终指向人，任意一定速度作圆周运动。
English Description：
Dog chasing procedure, the dog bubbles at a certain speed from the origin, the direction of speed always points to people, and makes circular motion at any certain speed