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燃气循环 : 54 phrases in 11 subjects |
| Automobiles | 4 |
| Aviation | 2 |
| Ecology | 1 |
| Electric machinery | 9 |
| Electronics | 8 |
| Mechanics | 4 |
| Nautical | 6 |
| Oil / petroleum | 2 |
| Rail transport | 2 |
| Space | 3 |
| Technology | 13 |
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