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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  invest in this single animal,
  他可以到农场去喂养
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  and then he followed this animal
  并跟踪牛的生长过程
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  through the various places in its lifecycle,
  他研究牛生活的各个方面
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  and tried to figure out how much energy was required to raise it.
  并且试图计算出饲养牛所需要的能源消耗
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  First, there was the shipping of the calf to the feed lot,
  首先小牛被带到了育肥栏
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  so the calf is born in one place and then
  因此小牛生在一个地方
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  it's shipped to a different place,
  然后被运到另一个地方
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  to a feed lot, so there's oil required for that.
  为了饲养它 这里消耗了汽油
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  The feed to feed that animal isn't grown locally
  喂养所用的饲料不是当地出产的
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  and the calf isn't grazing, but it's feed that's shipped in,
  也不是通过放牧喂养 饲料是运过来的
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  and a feed lot might be an example of that picture
  牧草的喂养可能就像上次看过的
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  that you saw before of California and the 100,000 cows.
  加利福尼亚十万头牛的图片上那样