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有机土壤 : 47 phrases in 10 subjects |
| Agriculture | 3 |
| Biology | 1 |
| Desert science | 4 |
| Earth sciences | 11 |
| Ecology | 7 |
| Environment | 1 |
| Hydroelectric power stations | 1 |
| Soil science | 6 |
| Technology | 11 |
| United Nations | 2 |
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