| environ. |
dune A low mound, ridge, bank, or hill of loose, windblown granular material (generally sand, sometimes volcanic ash), either bare or covered with vegetation, capable of movement from place but always retaining its characteristic shape (松散的、被风吹动的粒状物(通常是沙子，有时是火山灰)所形成的低墩、山脊、沙洲或小丘，可能是光秃秃或覆盖着植被，能移动位置但总保留着它的形状特征。); sand dune An accumulation of loose sand heaped up by the wind, commonly found along low-lying seashores above high-tide level, more rarely on the border of large lakes or river valleys, as well as in various desert regions, where there is abundant dry surface sand during some part of the year (被风堆积的松散的沙的沉积，常在有很高的潮水和地势低洼的海边，很少在大湖边或河流边。同样也在很多沙漠地区，那里有很多多年积累在地表的沙。) |
