The basic problem with the use of solar photovoltaic devices is economics, but until recently very little progress had been made toward the development of lo-cost photovoltaic devices.
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释义
使用太阳能光电设备的根本问题是经济问题,直到最近,在研制低成本的太阳能光电设备上,几乎没有取得什么进展。
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