通常这种热-电转化方式是利用热电偶实现的。 热电偶由两层不同的金属构成，其中一层比另一层温度高时就在两层金属间产生电流。
The usual way to do this is with a thermocouple—a sandwich of two metals that produce a current when one side of the sandwich is hotter than the other.
处于温暖的房间中会减少热电偶产生的可用能量。
Sitting in a warm room reduces the power available from thermocouples.
人体与外部环境的温差意味着热电偶能够产生一定数量能量。
Temperature differences between the body and the ambient air mean that thermoelectric couples can generate useful quantities of juice.
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