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平均压 力 : 20 phrases in 10 subjects |
| Aerohydrodynamics | 1 |
| Astronautics | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| General | 3 |
| Geology | 1 |
| Mining | 1 |
| Oil / petroleum | 1 |
| Oil and gas | 2 |
| Technology | 8 |
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