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| 坑底 | |||
| 露天采场的底部面 | |||
| 露天采场底面; 井筒工作面 (凿井时) | |||
| pit bottom: 13 phrases in 4 subjects |
| Automobiles | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Metallurgy | 4 |
| Technology | 6 |
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