There's a cathode, which is the positive electrode.

一个是阴极，它是阳性电极。

Once all the electrons have reached the positive electrode, the battery is considered discharged, meaning it's out of power.

一旦所有的电子都流向正极，电池则放电完毕，电量耗尽。

Different chemical reactions occur at the battery's positive and negative electrodes.

电池的正极和负极会发生不同的化学反应。