The goal of hybrid systems is to extract the most heat, minimize drilling costs.

混合系统的目标是要萃炼出最大量的热能，并把钻掘成本压到最低。

These high temperature zones are hard to find, and drilling this deep for just one of the several wells a plant will need can cost up to $20 million.

这些高温区很难找到，而仅为工厂需要的几口井中的一口钻这么深的井就可能花费高达 2000 万美元。