評(píng)論
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Battery
電池
A battery is a box of electricity.
電池是一盒電。
It stores chemical energy and this chemical energy changes into electricity.
它能儲(chǔ)存可以轉(zhuǎn)化為電能的化學(xué)能。
Can you name the things that need batteries?
你能列舉出需要電池的物品嗎？
A clock may need a battery.
鐘表可能會(huì)用到電池。
A car needs a battery to start its engine.
汽車需要電池來發(fā)動(dòng)引擎。
Many things around us are useless without batteries.
我們身邊的很多東西沒有電池就一無是處。
Do you know that batteries were very huge a long time ago?
你知道很久以前電池的體積很大嗎？
People couldn't carry batteries because they were too heavy.
人們攜帶不了電池，因?yàn)樗鼈兲恐亓恕?/div>
So, scientists developed small batteries.
因此，科學(xué)家研制出了小型電池。
Now, we can carry them everywhere.
如今，我們?nèi)ツ睦锒寄軒纤鼈儭?/p>
