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。
If your pencil box is broken, the batteries in your flashlights run out, or you have some leftover food, how will you deal with these things?
如果你的铅笔盒坏了、手电筒的电池没电了、或者你吃剩下了一些食物,你将如何处理这些东西?
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