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| mulch A layer of organic material applied to the surface of the ground to retain moisture; mulching is the spreading of leaves, straw or other loose material on the ground to prevent erosion, evaporation or freezing of plant roots | |||
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mulch : 6 短语, 4 学科 |
| 土壤科学 | 1 |
| 生命科学 | 1 |
| 自然科学 | 3 |
| 自然资源和野生动物保护 | 1 |