新月形沙丘,弧形沙洲
Another kind of dunes are barchan dunes. 还有一种类型叫做弧形沙丘。
Parabolic dunes are the opposite of barchan dunes. 新月型沙丘则跟弧形沙丘相反。
Barchan dunes are produced by strong winds blowing across a level surface and are crescent shaped. 强风吹过表面形成弧形沙丘而就是新月形。
The scattered single barchan dunes on the non sand bed possess movability and form unstability except the high large crescent sand mountain. 非沙质床面零星分布的单个新月形沙丘具有明显的移动性和形态的不稳定性（高大新月形沙山除外）。
The Martian North Pole is ringed by many similar fields of barchan sand dunes, whose strange, smooth arcs are shaped by persistent Martian winds. 火星北极被许多类似的弧形沙丘包围着，由于一直不断吹着的火星风侵蚀出了这样奇怪而又平滑的形状。
