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地网系统 : 18 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Computer networks | 1 |
| Earth sciences | 2 |
| Electronics | 7 |
| General | 1 |
| Project management | 1 |
| Space | 2 |
| Technology | 1 |
| United States | 1 |
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