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| formation boundary; stratigraphic boundary | |||
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地层边界 : 18 phrases in 8 subjects |
| Aviation | 1 |
| Drilling | 1 |
| Engineering geology | 1 |
| Geophysics | 1 |
| Oil / petroleum | 2 |
| Space | 1 |
| Technology | 7 |
| Wind Energy | 4 |
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