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| 竖井开挖 | |||
| 凿井 | |||
| 开挖竖井; 井筒掘进; 竖井挖掘机; 竖井掘进; 大竖井 | |||
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shaft excavation : 3 phrases in 2 subjects |
| Earth sciences | 1 |
| Technology | 2 |
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