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| 低品位矿 | |||
| 贫矿 | |||
| 低级矿; 贫矿石 | |||
| 低品位矿石 | |||
| |||
| 贫矿石 | |||
| 低品位矿石; 贫矿 | |||
| 低级矿; 贫矿 (石) | |||
| low grade ore: 3 phrases in 2 subjects |
| Metallurgy | 2 |
| Technology | 1 |
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