...叠板弹簧 laminatedspring ; tupespring ; leaf of a laminated spring 投梭板弹簧 picking stick spring ; stick spring 椭圆形板弹簧 elliptic spring bolster ; Full elliptic spring ..
In traditional geothermal energy, engineers drill near a geyser, hot spring or volcano, stick a valve and turbine on the hot water, and that's pretty much it.