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暗 管 : 94 phrases in 20 subjects |
Agriculture | 7 |
Air defense | 1 |
Animal husbandry | 1 |
Architecture | 2 |
Aviation | 1 |
Construction | 2 |
Desert science | 2 |
Ecology | 2 |
Engineering geology | 3 |
General | 5 |
Hydroelectric power stations | 10 |
Latin | 1 |
Metallurgy | 1 |
Oil / petroleum | 1 |
Radio | 1 |
Refrigeration | 3 |
Space | 5 |
Technology | 43 |
Telecommunications | 2 |
Water resources | 1 |