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| pure sand; sharp sand; sheer sand | |||
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纯砂 : 32 phrases in 7 subjects |
| Earth sciences | 1 |
| General | 2 |
| Geophysics | 1 |
| Metallurgy | 2 |
| Mining | 1 |
| Oil / petroleum | 10 |
| Technology | 15 |
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