Apparently he just dug it out of the rock face with his walking stick.

看上去他就是用手杖从岩面里把它挖了出来。

youdao

It's the classic blueprint of a medieval castle, its thick outer walls separated from the inner structure by a moat dug out of the rock.

这是一座典型的中世纪城堡，一条由岩石槽出的护城河把它厚实的外墙和内部建筑从结构上分开。

youdao

Several tons of rock had to be dug out of the ground just to make one barrel of oil.

NPR: Industry Seeks to Extract Oil from Rocky Mountain Shale