一个LED既可以在给定了电压且电流合适时亮起来，又可以在光照下生成电压(请参见参考资料部分给出的Mike Cook的文章)。

An LED can both light up when given current at a suitable voltage and generate a voltage when exposed to light (see Mike Cook's article in Resources).

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加载电压时，正负电荷分别在两个电极上聚集，生成一股挤压聚合物的引力。

When a voltage is applied, positive charge builds up on one electrode and negative charge on the other, creating an attractive force that squeezes the polymer.

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在研制这种多电平逆变器时，一个关键的问题就是如何来产生开关角度，并以此来生成基波电压且不产生特定的低次谐波。

A key issue in the design of such an inverter is to determine the switching angles so as to produce the fundamental voltage and not to generate specific lower order harmonics.

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