雨滴落在太阳能电池板上，然后滚落下来，此时它与电池板表面产生摩擦力，这种摩擦力可以转化为电能。
When a raindrop falls on the solar panel and then rolls down, it creates friction on the surface of the panel, which can then be turned into electricity.
然而，电池表面的自由电子无法通过这种方式成为电流传出。
The electrons knocked free at the surface of the cell, however, were not being carried away in this manner.
通过电池暴露在空气中的表面所吸入的氧气在碳孔中进行反应为电池放电。
The oxygen, which will be drawn in through a surface of the battery exposed to air, reacts within the pores of the carbon to discharge the battery.
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