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| 深孔 | |||
| 长距离穴; 长洞 | |||
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long hole : 54 phrases in 6 subjects |
| Architecture | 1 |
| Drilling | 1 |
| Engineering geology | 7 |
| Explosives and Explosive Ordnance Disposal | 23 |
| Geophysics | 1 |
| Technology | 21 |
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