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| hard mineral (莫氏硬度高于7) | |||
| hard ore | |||
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硬矿石 : 17 phrases in 5 subjects |
| Earth sciences | 2 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Metallurgy | 1 |
| Technology | 12 |
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