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| 光学瞄准器具 | |||
| 光学瞄准器 | |||
| 光学瞄准镜 | |||
| 光学瞄准具 | |||
| 光学瞄准; 瞄准望远镜 | |||
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| 光学瞄准; 瞄准望远镜 | |||
| optical sight: 28 phrases in 6 subjects |
| Aviation | 11 |
| Electronics | 4 |
| Shipbuilding | 1 |
| Space | 5 |
| Technology | 6 |
| Telecommunications | 1 |
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