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圆孔 : 82 phrases in 11 subjects |
| Electronics | 1 |
| Food industry | 1 |
| General | 37 |
| Mathematics | 1 |
| Medical | 12 |
| Metallurgy | 4 |
| Photography | 1 |
| Physics | 1 |
| Pipelines | 2 |
| Roll stock | 2 |
| Technology | 20 |
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