该国的主要地形是沙漠平原和沙丘，还有环绕尼日尔河的一个大草原。
Currently most of its terrain is made up of desert plains and sand dunes with some savanna around the Niger river.
瑞士的主要地形有三种：瑞士阿尔卑斯山、瑞士高原和汝拉(jura)山。
Switzerland comprises three basic topographical areas: the Swiss Alps, the Swiss plateau, and the Jura mountain.
曼省主要地形属平原，省内大小湖泊众多，共计38,500个，其中以温尼伯湖最大，为世界第十三大湖。
The main terrain of Manitoba is plains, with the lakes of various size totaling 38,500, among which lake Winnipeg is the largest one and ranks 13th largest in the world.
从地形上美国可以分成3个主要地区。
Physiographically, the United States may be separated into three major divisions.
与地形数据综合一样，专题数据综合需要依据一定的综合规则来保障数据综合围绕应用的需求、反映主要地理特征。
As the generalization of topographic data, thematic data generalization needs the support of generalization knowledge to satisfy the use requirements and reflect the main geographic nature.
与地形数据综合一样，专题数据综合需要依据一定的综合规则来保障数据综合围绕应用的需求、反映主要地理特征。
As the generalization of topographic data, thematic data generalization needs the support of generalization knowledge to satisfy the use requirements and reflect the main geographic nature.
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