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| space surveillance; space watch; space-surveillance (system, 系统) | |||
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空间监视 : 65 phrases in 7 subjects |
| Air defense | 9 |
| Aviation | 6 |
| Earth sciences | 1 |
| Electronics | 11 |
| General | 2 |
| Space | 28 |
| United States | 8 |
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