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| air traffic service | |||
| airline operation | |||
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航空 业务 : 32 phrases in 10 subjects |
| Aviation | 9 |
| Business | 1 |
| Earth sciences | 2 |
| Electronics | 2 |
| General | 1 |
| Information technology | 3 |
| Military | 1 |
| Space | 10 |
| Telecommunications | 1 |
| United States | 2 |
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