評論
打印
Dam
水壩
If you want to use water for electric power and to prevent flooding or drought, what should you do?
如果你想用水發電，防洪或防旱，你該怎么做？
You have to make a dam.
你得建座水壩。
A dam is very useful for many reasons.
水壩非常有用的原因有很多。
A long time ago, people build dams to grow grains and vegetables.
很久以前，人們筑水壩來種糧食和蔬菜。
What was the first dam in history?
歷史上第一座水壩是哪個？
It was a dam in Jordan.
它是約旦的一座水壩。
But the dam was soon destroyed by rain.
但它很快就被雨水給沖毀了。
Now, there are millions of dams all over the world.
現在，全世界有幾百萬座水壩。
Without dams many cities will be flooded every time it rains.
沒有了水壩，每次下雨很多城市都會被水淹沒。
