我们所熟悉的手电筒，袖珍收音机和汽车照明系统，他们都是用蓄电池作为电源的。

We are all familiar with flashlights, portable radios and car lighting systems, all of which use batteries as their source power.

youdao

我们所熟悉的手电筒，袖珍收音机和汽车照明系统，他们都是用蓄电池作为电源的。

We are all familiar with flashlights, portable radios and car lighting systems, all of which use batteries as their source power.

youdao