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单动 发动机 : 98 phrases in 13 subjects |
| Agriculture | 3 |
| Automobiles | 15 |
| Aviation | 12 |
| Chemistry | 1 |
| Drilling | 1 |
| General | 4 |
| Metallurgy | 2 |
| Nautical | 3 |
| Oil / petroleum | 3 |
| Shipbuilding | 1 |
| Skydiving | 1 |
| Space | 9 |
| Technology | 43 |
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