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.
建筑顶部的屋顶花园与附近沙丘的地形相吻合，且从远处清晰可见，激起了成千上万游客来该岛的好奇心。
Roof gardens on top of the built structure respond to the topography of the near-by dunes and are visible from far away, provoking curiosity in visitors to the island.
剖面地形具有典型的夷直海岸特点，前滨滩面宽阔平坦，后滨沙丘带发育，岸线平直。
Its foreshore is broad and smooth, its backshore consists of dunes and its coastline is rather straight.
沙地植被在沙丘-丘间低地景观尺度上的分布格局决定于地形及因地形而异的土壤水分梯度。
The vegetation distributing pattern at the scale of dune-lowland lies on the terrain and the soil water gradient.
这些足以说明，在自然状况下，河流演变在沙丘群和沙地形成演化中起着非常重要的促进作用。
Therefore, river evolution has very vital initiative and promoting effects on the formation and development of sand-dune groups and sandy land in natural conditions.
目前对风沙运动的研究主要集中在对平坦沙床上的风沙流进行理论与数值模拟，而对复杂地形和沙丘上的风沙运动的理论与数值模拟则相对很少。
At present the study of the movement of sands mainly focuses on theoretical analysis of and numerical simulations of blown sand on the flat bed of sand.
目前对风沙运动的研究主要集中在对平坦沙床上的风沙流进行理论与数值模拟，而对复杂地形和沙丘上的风沙运动的理论与数值模拟则相对很少。
At present the study of the movement of sands mainly focuses on theoretical analysis of and numerical simulations of blown sand on the flat bed of sand.
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