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金 刚 石硬度 : 26 phrases in 9 subjects |
| Automobiles | 2 |
| Earth sciences | 3 |
| Geology | 1 |
| Geophysics | 1 |
| Jewelry | 1 |
| Metallurgy | 5 |
| Oil / petroleum | 2 |
| Shipbuilding | 3 |
| Technology | 8 |
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