賽夫沙丘(順著風(fēng)向的長沙丘)
Longitudinal or seif dunes are dunes that are parallel to a strong wind that blows in one general direction. 縱向或者賽夫沙丘是與強風(fēng)平行的沙丘，風(fēng)總是以相同方向刮過。
