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来自于日光的电能是真正“绿色”和廉价的能源，但是需要基于光伏(PV)电池和存储设备(例如电池)的能量转换系统。
Electricity from sunlight is truly "green" and inexpensive but requires an energy conversion system with photovoltaic (PV) cells and a storage unit, such as a battery.
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