First, engineers drill a well several kilometers into permeable rock like sandstone or basalt.

首先，工程师在砂岩或玄武岩等可渗透岩石中钻几公里的井。

They’re really permeable rock masses that easily store groundwater and act as a water supply.

它们是真正具有渗透性的岩体，可以很容易地储存地下水并充当供水。