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| 摩擦球; 球垫 | |||
| 钢滚珠; 钢珠 (轴承用) | |||
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| 〔轴承的〕钢珠 | |||
| 摩擦滚珠 | |||
| friction ball: 8 phrases in 3 subjects |
| Automobiles | 2 |
| Drilling | 1 |
| Oil / petroleum | 5 |
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