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| subsurface exploration | |||
| underground exploration | |||
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地下 勘探 : 12 phrases in 7 subjects |
| Desert science | 1 |
| Earth sciences | 1 |
| Engineering geology | 2 |
| General | 1 |
| Geology | 1 |
| Oil / petroleum | 2 |
| Technology | 4 |
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