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10集》

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  Again, we're talking about the just corn part of this.
  说回来 我们只是讨论了玉米这部分
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  If I showed you the ingredient list from a bag of Doritos
  如果看一看多力多滋袋子上的配料表
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  --I don't know how many things are in it,
  我不知道一袋会有多少原料
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  but it's probably thirty ingredients or something like that
  但大约有三十种配料的样子
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  --each of these ingredients will have an energy cost,
  每一种配料都会有能源消耗
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  but since corn is the predominant we can talk about that.
  但既然我们主要谈论的是玉米
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  We can think about the oil that's necessary
  我们可以研究一下
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  to create this transaction of
  在购买一袋像多力多滋
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  just buying something simple like a bag of Doritos.
  这样的食品的交易中所消耗的石油
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  Well, there's oil involved in the genetic modification of
  在玉米的转基因过程中以及
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  the corn and bringing those seeds to the farmer.
  种子送到农民手里均需要能耗
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  There's the seed transport from the place
  种子从转基因种子育种地