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| 光学探测系统 | |||
| optical detection system: 20 phrases in 8 subjects |
| Air defense | 3 |
| Aviation | 4 |
| Earth sciences | 3 |
| Electronics | 2 |
| Geophysics | 1 |
| Nautical | 1 |
| Space | 4 |
| Technology | 2 |
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