我有三张二十美元的钞票。
这些饮食就像给某人五张五美元的钞票来换取他的一张二十美元的钞票。
These diets are like giving someone five five-dollar bills for their twenty-dollar bill.
如果把一屋子金锭或者一大堆二十美元的钞票堆到外星人面前亦或是他在电脑屏幕前看到一长串数字，他可能茫然不知所措这些东西有何用处。我们对这些东西顶礼膜拜，而在他看来也许离奇怪异。
Were an extraterrestrial to be shown a room full of gold ingots, a stack of twenty-dollar bills or a row of Numbers on a computer screen, he might be puzzled as to their function.
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