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| optic tracker system; optical tracker system | |||
| 光 跟 踪系统: 75 phrases in 10 subjects |
| Air defense | 5 |
| Automobiles | 1 |
| Aviation | 11 |
| Earth sciences | 1 |
| Electronics | 13 |
| Missiles | 2 |
| Navigation | 1 |
| Space | 20 |
| Technology | 20 |
| United States | 1 |
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