来自《耶鲁大学开放课程：有关食物的心理学、生物学和政治学 第3集 第3集》

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  let's say,
  比如说
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  you could calculate the amount of heat that you can produce from oil
  你可以计算从石油中提炼出来的热量
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  and that could be measured in calories if you wish to do it,
  如果你愿意热量可以用卡路里来计算
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  but people usually apply it to food.
  但人们一般应用在食物中
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  So it's the amount of energy,
  所以卡路里是能量的总额
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  usable energy for the body that a food provides.
  食物所提供的被人体吸收的能量
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  If we look at two different foods here,
  让我们看看两种不同的食物
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  broccoli and the brownie on the right,
  左边花椰菜 右边布朗尼蛋糕
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  they're of course much different in calories
  它们除了卡路里含量不同
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  but they're different in other ways.
  还有其他差别
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  They deliver different amounts of energy
  它们提供的能量不等
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  and they also deliver different amounts of nutrients,
  提供的营养数量也是不同的