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成井 : 49 phrases in 10 subjects |
| Drilling | 18 |
| Forestry | 1 |
| General | 12 |
| Geology | 1 |
| Geophysics | 5 |
| Mining | 1 |
| Oil / petroleum | 5 |
| Oil and gas | 2 |
| Oil and gas technology | 1 |
| Oilfields | 3 |
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