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| natural stratum | |||
| primary formation; prime stratum | |||
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原 始地层 : 15 phrases in 7 subjects |
| Desert science | 2 |
| Drilling | 3 |
| Engineering geology | 4 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 2 |
| Oil / petroleum | 2 |
| Technology | 1 |
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