Under normal circumstances, Drifting in the rock face of the gushing water, in the concentration of multiple drillrockdrill before the solids content of at least.
一般情况下，在岩石平巷掘进工作面的涌水中，在多台凿岩机集中打眼之前，固体颗粒含量最少。
2
The drill is strong enough to bore through solid rock.
这把钻足以钻透坚固的岩石。
《牛津词典》
3
Miners watch as the drill machine 'Sissi' breaks through the rock on the final section of the Gotthard Tunnel.