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观测台 : 140 phrases in 18 subjects |
Air defense | 1 |
Architecture | 1 |
Aviation | 11 |
Bridge construction | 1 |
Business | 1 |
Desert science | 1 |
Earth sciences | 30 |
Ecology | 1 |
Electronics | 16 |
Engineering geology | 2 |
General | 2 |
Geophysics | 3 |
Metallurgy | 1 |
Nuclear and fusion power | 1 |
Shipbuilding | 1 |
Space | 38 |
Technology | 24 |
United States | 5 |