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.
本周我们主要学习各种不同的地形知识，比如峡谷，沙丘等。
We began learning about landforms like canyons, and sand dunes.
对分布于古尔班通古特沙漠南缘典型沙质荒漠大沙鼠的巢域选择特征研究表明，该鼠种主要选择丘间地及固定沙丘为筑巢地形。
The research about home range choose of the desert great gerbil in south of Zhungur desert shows the gerbil choose mainly the site between sand dune to built it nest.
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