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| communication relay | |||
| 通信中继: 69 phrases in 11 subjects |
| Air defense | 2 |
| Aviation | 9 |
| Communications | 8 |
| Computer networks | 1 |
| Earth sciences | 1 |
| Electronics | 12 |
| General | 2 |
| Space | 23 |
| Technology | 6 |
| Telecommunications | 4 |
| United States | 1 |
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