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| 导洞巷道 | |||
| 掌子面 | |||
| 导洞; 巷道; 导洞掘进 | |||
| 超前导坑; 先进导坑; 导洞掌子面; 超前巷道 | |||
| pilot drift: 3 phrases in 2 subjects |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 2 |
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