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optical unit |
光 单 元 : 65 phrases in 13 subjects |
Air defense | 2 |
Aviation | 4 |
Communications | 3 |
Electronics | 29 |
General | 2 |
Information technology | 8 |
Nautical | 1 |
Oil / petroleum | 1 |
Solar power | 1 |
Space | 2 |
Sports | 3 |
Technology | 7 |
Telecommunications | 2 |