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| 摩擦鼓轮; 摩擦筒 | |||
| friction-drum: 6 phrases in 6 subjects |
| Automobiles | 1 |
| Chemistry | 1 |
| Electric machinery | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Plastics | 1 |
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