Geographic information is the main contents of cartographic communication and the inner thread of cartographic communication system.
地理信息是地图信息传递的主要内容，也是地图信息传递系统的内在联系。
Geographic information is the main contents of cartographic communication and the inner thread of cartographic communication system.
地理信息是地图信息传递的主要内容，也是地图信息传递系统的内在联系。
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