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| 珀莫松纟刍呢 | |||
| 珀莫纟刍呢 | |||
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| 二叠纪，系 | |||
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permo : 13 phrases in 6 subjects |
| Drilling | 3 |
| Engineering geology | 5 |
| Geology | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 2 |
| Technology | 1 |
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