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| 光学水晶; 光学晶体 | |||
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| 光学水晶; 光学晶体 | |||
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optical crystal : 34 phrases in 8 subjects |
| Aviation | 1 |
| Electronics | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 3 |
| Shipbuilding | 1 |
| Space | 3 |
| Technology | 19 |
| Telecommunications | 4 |
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