巨大的发电机一刻不停地发出电力。
莹光灯泡只需用四分之一的电力，就能发出同样的亮度。
They use only one-quarter of the electricity to give off the same light.
太阳能电池是一种将从太阳发出的能量转化成电力的装置。
A solar cell is a device for converting energy from the sun into electricity.
太阳能电池是一种将从太阳发出的能量转化成电力的装置。
A solar cell is a device for converting energy from the sun into electricity.
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