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airborne surveillance airborne control; airborne surveillance, airborne control; airborne surveillance, ground control | |||
air surveillance | |||
aerial surveillance |
空中监视 : 56 phrases in 7 subjects |
Air defense | 6 |
Aviation | 15 |
Electronics | 15 |
General | 1 |
Space | 12 |
Technology | 2 |
United States | 5 |