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to phrases
shaft excavation
eng.geol.
竖井开挖
expl.
凿井
tech.
开挖竖井
;
井筒掘进
;
竖井挖掘机
;
竖井掘进
;
大竖井
shaft excavation
:
3 phrases
in 2 subjects
Earth sciences
1
Technology
2
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