剑桥词典a deep hole made in the ground when looking for oil , gas , or water （爲尋找石油、天然氣或水而鑽的）鑽井，鑽孔 We must sink a borehole so that people will have water . 爲了讓大家有水喫，我們必須掘井。 They obtained information about the rock by drilling boreholes. 他們通過鑽孔獲知了關於巖石的情況。 返回 borehole