Needs and wants
需要和想要
People have needs and wants.
人们有需求和欲望。
Needs are things we must have to live.
需求是我们必须生活的东西。
Food, shelter and clothes are needs.
食物、住所和衣服都是必需品。
Wants are things we would like to have.
欲望是我们想要拥有的东西。
Dolls and candy are wants.
娃娃和糖果是想要的。
We use money to buy what we need and want.
我们用钱买我们需要和想要的东西。
There are different types of money.
有不同类型的钱。
Bills and coins are types of money.
纸币和硬币都是货币的种类。
A bill has more value than a coin.
钞票比硬币更有价值。
A coin is money made of metal.
硬币是由金属制成的货币。
There are many types of coin.
硬币有很多种。
A quarter and a penny are two kinds of coin in America.
25美分和1便士在美国是两种硬币。
Sometimes there is not much of something.
有时没有多少东西。
This is called a scarcity.
这被称为稀缺性。
We do not always have enough money to buy all we want.
我们并不总是有足够的钱来购买我们想要的一切。
That's why we have to choose between things.
这就是为什么我们必须在事物之间做出选择。