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燃气度 : 29 phrases in 10 subjects |
| Astronautics | 1 |
| Automobiles | 1 |
| Aviation | 8 |
| Electronics | 1 |
| Mechanics | 1 |
| Metallurgy | 1 |
| Nautical | 1 |
| Oil / petroleum | 4 |
| Space | 6 |
| Technology | 5 |
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