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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  but also dealing with food in different ways.
  还有了很多处理食物的方法
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  Instead of just eating them at the time there would be processing of it.
  人们不再茹毛饮血 而是会处理食材
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  There would be some sort of cooking,
  食物会被烹制
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  some attempt to store food
  有人试着储藏食物
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  for when people may have been hungry later, etc.
  以防饥饿
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  Then going from a plant based diet to a diet that included meat.
  人类的饮食由植食性发展为含肉类的饮食
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  Now these were important changes because humans of course can--
  这些是很重要的变化 显然人类现在
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  are omnivores and can eat both plants and animals, and therefore,
  是杂食动物 能够进食植物和动物
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  the ability to secure nutrients from these different sources
  因为营养来源的多元化
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  became very appealing to humans.
  对人类来说很重要
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  Phase Two,
  第二阶段
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  in the middle Pleistocene phase--700,000 years ago.
  在更新世的中期 约七十万年前