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| 研磨球 | |||
| mill ball: 117 phrases in 11 subjects |
| Architecture | 3 |
| Chemistry | 3 |
| Construction | 3 |
| Electric machinery | 1 |
| General | 1 |
| Metallurgy | 20 |
| Oil / petroleum | 2 |
| Plastics | 1 |
| Polymers | 1 |
| Shipbuilding | 1 |
| Technology | 81 |
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