再过一个星期就是你的生日，奶奶也许会给你一张崭新的一美元钞票。
Your birthday's only a week away and you might get another 5 crisp dollar bill from Grandma.
每一个人都知道一美元钞票值多少，但并不是每一个人知道种玉米需要什么。
Each person knows how much a dollar bill is worth, not everyone knows what it takes to make that corn.
现在在伊利诺伊州西北大学的研究者们，当时由德尔克·布洛克曼带头，对超过五十万张一美元钞票在五年内的活动情况进行了分析。
Researchers led by Dirk Brockmann, now at Northwestern University in Illinois, analysed the movements of more than half a million US one-dollar bills as they were passed around over five years.
应用推荐