borehole
noun [ C ] uk/ˈbɔː.həʊl/ us/ˈbɔːr.hoʊl/
（为寻找石油、天然气或水而钻的）钻井，钻孔
a deep hole made in the ground when looking for oil, gas, or water
We must sink a borehole so that people will have water. 为了让大家有水吃，我们必须掘井。
They obtained information about the rock by drilling boreholes. 他们通过钻孔获知了关于岩石的情况。