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| 竖井掘进盾构 | |||
| 竖井钻车 | |||
| 竖井钻架; 竖井挖掘机; 竖井掘进机; 竖井井架; 盾构掘进机 | |||
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shaft jumbo : 4 phrases in 2 subjects |
| Explosives and Explosive Ordnance Disposal | 1 |
| Technology | 3 |
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