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2集 第2集》

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  you would see this sort of activity for finding food.
  你都能看到有人在寻找食物
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  But again, the elements were harsh,
  可是 自然环境是恶劣的
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  finding food may not have been easy,
  寻找食物一点也不简单
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  and certain sorts of diets would prevail over others,
  不过某些食物相对其他更为常见些
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  where there would be a lot of certain nutrients and few of other ones.
  其富含有某些营养成分 但缺乏其他的
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  Humans suffered as a consequence from nutritional deficiencies
  几乎全世界的人们都饱受营养不良的困扰
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  in almost all parts of the world because there weren't complete diets.
  因为他们没有平衡的食谱
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  Then you see way back in human histories
  让我们回到人类演化史上
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  figures like this where people had to go hunt for their food,
  如这张图所示 人们不得不去狩猎觅食
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  and of course there was danger involved in this.
  当然 这是非常危险的
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  uncertainty of the food supply and the like.
  而且食物供给也不稳定
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  This is all pretty well known.
  这些都众所周知