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复合 系统 : 83 phrases in 18 subjects |
Air defense | 3 |
Automobiles | 2 |
Aviation | 3 |
Chemistry | 1 |
Desert science | 2 |
Drilling | 1 |
Earth sciences | 3 |
Ecology | 4 |
Electronics | 10 |
Forestry | 1 |
Hydroelectric power stations | 1 |
Information technology | 1 |
Oil / petroleum | 1 |
Refrigeration | 6 |
Space | 28 |
Technology | 13 |
Telecommunications | 1 |
Water resources | 2 |