The contact surface is a wide rim that contains copper electrodes and a polymer coating.

接触表面是一个宽边， 包含铜电极和聚合物涂层。

The result is hydrogen gas, which, if we were in there, we might be able to see is very, very tiny bubbles, forming on the copper electrode.

结果就是氢气（我们可以看到非常非常小的气泡）在铜电极附近形成。