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磷岩 : 93 phrases in 12 subjects |
| Agriculture | 4 |
| Architecture | 1 |
| Chemistry | 3 |
| Desert science | 15 |
| Earth sciences | 2 |
| Engineering geology | 2 |
| General | 6 |
| Geology | 2 |
| Metallurgy | 3 |
| Name of organization | 1 |
| Oil / petroleum | 16 |
| Technology | 38 |
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