Constructing cartographic model is helpful to make complex system simplified and comparison is a main stage of model construction.
建立地图模型，有助于使复杂系统简单化，而比较是建立模型的主要环节。
Constructing cartographic model is helpful to make complex system simplified and comparison is a main stage of model construction.
建立地图模型，有助于使复杂系统简单化，而比较是建立模型的主要环节。
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