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| 活塞顶头部 | |||
| 活塞顶; 活塞头 | |||
| piston head: 40 phrases in 7 subjects |
| Automobiles | 15 |
| Compressors | 3 |
| General | 1 |
| Nautical | 1 |
| Oil / petroleum | 1 |
| Shipbuilding | 3 |
| Technology | 16 |
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