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| 地区通信系统 | |||
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area communications system : 19 phrases in 8 subjects |
| Air defense | 3 |
| Aviation | 2 |
| Computer networks | 1 |
| Earth sciences | 1 |
| Electronics | 5 |
| Space | 4 |
| Telecommunications | 1 |
| United States | 2 |
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