新月形沙丘,弧形沙洲

Another kind of dunes are barchan dunes. 還有一種類型叫做弧形沙丘。

Parabolic dunes are the opposite of barchan dunes. 新月型沙丘則跟弧形沙丘相反。

Barchan dunes are produced by strong winds blowing across a level surface and are crescent shaped. 強風(fēng)吹過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. 非沙質(zhì)床面零星分布的單個新月形沙丘具有明顯的移動性和形態(tài)的不穩(wěn)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. 火星北極被許多類似的弧形沙丘包圍著，由于一直不斷吹著的火星風(fēng)侵蝕出了這樣奇怪而又平滑的形狀。