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在世界地图上指示地球卫星的轨道及其实时位置的设备是一种合适的观察卫星的手段。激光束可以严格地在大地图上使小点具有清晰的图象。
A device that indicates the orbit and the real-time location of Earth satellites on a world map is a suitable means of observing the satellites. The laser beam can make sharp dots sharply on a large map.