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| 定向射线: 17 phrases in 10 subjects |
| Air defense | 2 |
| Aviation | 1 |
| Earth sciences | 1 |
| General | 3 |
| Geophysics | 3 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 1 |
| Telecommunications | 2 |
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