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代码说明：

  机器人的全部目标是产生一个实验室的引导路线。实验室里的各种不同方向坐标已经存储，并且机器人在不同方向移动的非常成功。在某一方向，它可以给出该方向的位置。在不同方位的移动，机器人需要几个阶段，首先定位在某一位置，接着计算下一个方向的路程。(The overall goal of the robot is to conduct a guided tour of the laboratory. Coordinates of various stations in the room are stored, and the robot moves successively from station to station. At each station, it gives an explanation of that station. To move between stations, the robot make several steps, localizing itself at each step and recalculating the way to the next station)