For example, we can pack a suitcase with flashlights, a radio, food, drinking water and some tools.
例如,我们可以用手电筒、收音机、食物、饮用水和一些工具来装满一个手提箱。
We are all familiar with flashlights, portable radios and car lighting systems, all of which use batteries as their source power.
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。
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