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水源保护: 74 phrases in 14 subjects |
China | 2 |
Desert science | 1 |
Earth sciences | 2 |
Ecology | 9 |
Electronics | 2 |
Engineering geology | 2 |
Environment | 6 |
Hydroelectric power stations | 4 |
Hydrology | 2 |
Name of organization | 1 |
Nursing | 1 |
Rail transport | 4 |
Technology | 31 |
Water resources | 7 |