They occur primarily in regions of recent volcanic activity as hot, dry rock; natural hot water; or natural steam.
地热能主要以干热的岩石、自然热水或自然蒸汽的形式出现在近期火山活动的区域。
Dry steam, the oldest geothermal technology, takes steam out of fractures in the ground and USES it to directly drive a turbine.
干蒸汽发电是最古老的地热利用技术，从地面断层开采出蒸汽并直接用于驱动汽轮机。
In hot, dry parts of the world, turning sunlight into electricity directly with solar cells or indirectly with solar-powered steam turbines makes sense.
在那些热且干旱的地区用太阳能电池将太阳光直接转换为电能，或用太阳能蒸气涡轮机间接转换是可行的。
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