凿岩机：指用于凿岩的机械设备。
a drill for penetrating rock
同义词： bore bit / borer / rock drill
岩石钎子
石材钻
... 透明水晶钻crystal drill 石材钻stone drill 陶瓷砖钻tile drill ...
... 岩石强度系数：coefficient of rock strength 岩石钎子：stone drill 岩石平巷;运送充填料的平巷：waste roadway ...
... stone drier 干石机 stone drill 石钻 stone filter 石滤器 ...
It is not easy to drill a hole through the stone.
要在石头上钻个洞不容易。
Operate machine to drill holes in blocks or slabs of stone according to specifications.
操作机器，按规格在木块或石板上钻孔。
But they did see concentric grooves left by what they think was a drill with a tiny stone bit.