阿拉伯沙漠上一座高耸的沙丘脊指向着午后的落日。
The towering ridge of a sand dune in the Arabian Desert points to the afternoon sun.
阿曼一座新月形的沙丘脊由强信风吹成，在迎风的方向（图左侧）形成一面平缓的凸破，在背风面形成凹坡。
This crescent-shaped ridge of sand dune in Oman was formed by strong trade winds that form a smooth hill facing the wind (left) and concave slipface on the back.
应用推荐