美国第一座商业目的的地热田是1960年在Geysers兴建的，它可以生产11兆瓦的电力。现在这一地区单个地热站的平均发电量是50兆瓦。
The first commercial geothermal power plant in the U.S. was built at the Geysers in 1960; it produced 11 megawatts of power.
有限集田近似方法与平均场近似相比，在数学上处理同样简单，但可给出更好的结果。
The finite cluster approximation method is conceptually as simple as an ordinary mean field approximation, but gives much better results.
初步分析认为，虽然造价略高于甘肃省“窖灌田”工程的混凝土水窖平均造价，但低于陕西延安地区水窖造价。
Preliminary analysis showed that the cost is slightly higher than average cost of concrete cellar in"Project of Water Cellar Irrigating Field"in Gansu province but lower than that in Yan'an Shaanxi.
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