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| sand dune | |||
| dune | |||
| 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 | |||
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| sand dune | |||
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dune : 99 短语, 16 学科 |
| 一般 | 2 |
| 人权活动 | 1 |
| 农业 | 2 |
| 冶金 | 1 |
| 卫生保健 | 1 |
| 土壤科学 | 5 |
| 地球科学 | 9 |
| 建造 | 2 |
| 技术 | 3 |
| 环境 | 19 |
| 生命科学 | 5 |
| 社会科学 | 1 |
| 联合国 | 2 |
| 自然科学 | 10 |
| 自然资源和野生动物保护 | 29 |
| 运输 | 7 |