- construction of tunnels
- piercing of a tunnel
- tunnel drivage
- tunnel driving
- tunneling operation
- 隧道: tunnel; tunneling; tunnellin ...
- 掘进: driving; tunnelling; drillin ...
- 隧道掘进法: tunnel driving method
- 隧道掘进机: rock tunnel machine; tbm; trnnel boring machine; tu el borer; tu el boring machine; tu eller; tu elling machine; tunnel borer; tunnel boring machine; tunneler; tunneller; tunnelling machine
- 隧道掘进方向: direction of tunneling
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