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光孔径 : 70 phrases in 13 subjects |
| Air defense | 2 |
| Aviation | 3 |
| Cartography | 1 |
| Construction | 2 |
| Earth sciences | 2 |
| Electronics | 5 |
| General | 4 |
| Geophysics | 1 |
| Metallurgy | 4 |
| Oil / petroleum | 1 |
| Space | 10 |
| Technology | 34 |
| Telecommunications | 1 |
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