水 的 净化 : 30 phrases in 13 subjects |
Agriculture | 1 |
Animal husbandry | 1 |
Architecture | 1 |
Automobiles | 1 |
Electronics | 3 |
Energy industry | 1 |
Environment | 1 |
Genetics | 1 |
Geology | 1 |
Project management | 1 |
Technology | 16 |
United Nations | 1 |
Water resources | 1 |