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| ground layer; surface layer | |||
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| surface layer | |||
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近 地层 : 24 phrases in 12 subjects |
| Aviation | 2 |
| Bridge construction | 1 |
| Drilling | 1 |
| Earth sciences | 2 |
| Geology | 1 |
| Geophysics | 4 |
| Latin | 1 |
| Mining | 1 |
| Oil / petroleum | 4 |
| Soil science | 2 |
| Space | 2 |
| Wind Energy | 3 |
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