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护井 : 63 phrases in 12 subjects |
| Drilling | 5 |
| Earth sciences | 1 |
| Engineering geology | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 2 |
| Geophysics | 1 |
| Mining | 1 |
| Navigation | 1 |
| Oil / petroleum | 15 |
| Space | 3 |
| Technology | 28 |
| Water resources | 3 |
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