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平水井 : 71 phrases in 9 subjects |
| Drilling | 29 |
| Earth sciences | 2 |
| Engineering geology | 2 |
| Geophysics | 1 |
| Mining | 3 |
| Nautical | 1 |
| Oil / petroleum | 19 |
| Oil and gas technology | 1 |
| Technology | 13 |
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