十年前，美国消费者购买的东西71%都采用现金或者支票支付。
Ten years ago, American consumers paid cash or cheques for 71% of their purchases.
你十年前教给人们的东西不会和你现在教给他们的一样。
What you teach people ten years from now won’t be the same as what you teach them today.
几十年前，考古学家就已经开始用一项叫做碳14测年的方法来检测他们发掘的东西有多悠久。
For decades, archaeologists have used a technique called carbon dating to work out how old their finds are.
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