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| 四辊式的 (er) | |||
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four -roll : 17 phrases in 7 subjects |
| Basketball | 3 |
| Metallurgy | 5 |
| Plastics | 2 |
| Polymers | 1 |
| Shipbuilding | 1 |
| Steel production | 1 |
| Technology | 4 |
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