tunnel boring meaning in English

隧道钻挖工程

Friction plate for clutch disc in tunnel boring machine
半金属离合器摩擦片性能研究
Hard rock tunnel boring machine
岩石隧道钻挖机
Tunnel boring works
隧道挖掘工程
Safety of unshielded tunnel boring machines and rodless boring machines for rock
钻岩石用无护板的隧道掘进机和无杆轴掘进机的安全性
Safety of unshielded tunnel boring machines and rodless shaft boring machines for rock
钻岩石用无护板的隧道掘进机和无杆轴掘进机的安全性

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