为了开通隧道，工程师们将炸通硬岩石层。
To make the tunnel, engineers will have to blast through solid rock.
小井眼的第二种形式包括使用了在采矿工业中使用的硬岩石中的勘探技术。
A second form involves technology used for exploration boreholes in the hard rock mining industry.
0a型冲击-回转反循环工程钻机是以冲击钻进为主、回转钻进为辅的多功能钻机，可适应软、硬岩石等不同地层钻进的要求。
GCF-20A reverse circulation percussive rotary drill rig is a multi function drill rig with percussive drilling as the main means and rotary drilling as supplemented.
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