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活 塞 轴 : 34 phrases in 9 subjects |
| Automobiles | 7 |
| Chemistry | 2 |
| Compressors | 3 |
| Construction | 1 |
| Drilling | 2 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Space | 1 |
| Technology | 16 |
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