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| sand dunes | |||
| 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; dune | |||
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| dune | |||
| sand dune | |||
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dunas : 60 短语, 8 学科 |
| 土壤科学 | 10 |
| 地球科学 | 8 |
| 地质学 | 3 |
| 环境 | 21 |
| 生命科学 | 4 |
| 组织机构名称 | 1 |
| 联合国 | 2 |
| 自然科学 | 11 |