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7集 第7集》

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  and that would include areas like the United States,
  这类地区中也包括美国
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  occupy 40% of the world's land area but have 67% of the world's wealth.
  占据着世界40%的土地和67%的财富
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  The land area is more or less consistent
  土地面积多多少少
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  with the amount of the world's population,
  和世界人口数量有关
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  but the wealth is much higher.
  但财富和它的联系更为密切
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  You take areas like the highland and the desert parts of the world,
  设想你们有世界上的高原和沙漠地区
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  you have much less of the land area for the highland groups,
  分配给高原地区人们的土地很少
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  so that's only 7% of the world's population
  所以他们只占世界人口的7%
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  so we won't factor that in so much.
  因此我们不过多地考虑那个
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  The desert areas have only 18% of the world's population,
  沙漠地区仅有18%的世界人口
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  so we won't talk about that so much for the moment,
  所以我们现在不会多谈
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  but let's focus on tropical areas
  让我们注意一下热带地区