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全 球通信系统 : 44 phrases in 14 subjects |
Air defense | 2 |
Artificial intelligence | 1 |
Aviation | 2 |
Earth sciences | 1 |
Electronics | 17 |
General | 1 |
Geophysics | 1 |
Information technology | 2 |
Management | 1 |
Multimedia | 1 |
Nautical | 2 |
Space | 8 |
Telecommunications | 4 |
United States | 1 |