柯林斯詞典sand dune (sand dunes) 1. N-COUNT A sand dune is a hill of sand near the sea or in a sand desert. 沙丘[usu pl] 返回 sand dune劍橋詞典a hill of sand made by the wind on the coast or in a desert （風(fēng)吹成的）沙丘 返回 sand dune