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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 |
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