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低角度 : 21 phrases in 11 subjects |
| Air defense | 2 |
| Aviation | 3 |
| Drilling | 1 |
| Electronics | 1 |
| Geology | 1 |
| Geophysics | 1 |
| Military | 1 |
| Multimedia | 1 |
| Oil / petroleum | 2 |
| Oil processing plants | 1 |
| Technology | 7 |
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