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| 地下工程 | |||
| 地下工厂; 坑道作业; 井下作业 | |||
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| 地下工程 | |||
| 地下作业 | |||
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underground works : 6 phrases in 3 subjects |
| China | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Technology | 3 |
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