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有关环境 : 14 phrases in 8 subjects |
| Animal husbandry | 1 |
| Desert science | 1 |
| Ecology | 2 |
| Economy | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 2 |
| Technology | 1 |
| United Nations | 4 |
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