That light then reflects off the bottom plate and returns back through the lens.

然后，该光从底板反射 并通过镜头返回。

Then, the exhaust heat from the bottom plate of the thermoelectric device would be used in the traditional way to warm water up.

其次，从热电设备中位于底部的薄片中出来的排气可以用于传统方式来加热水。