来自《耶鲁大学开放课程：古希腊历史简介 第11集 第11集》

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  had become exhausted through over cropping and so on.
  已经因为过度开垦而开始耗竭
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  If Hanson is right,
  如果汉森的理论正确
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  this is less likely to be true
  那么前面的理论
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  than it used to be
  就不大可能成立
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  because there's more diversity,
  因为这时的农业
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  diversification of farming than there had been in the past.
  与之前相比已经更加多元化
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  Another theory is that a cause
  还有理论提出
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  of the problem was deforestation.
  造成这种现象的原因之一是滥砍滥伐
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  Well, it's perfectly true
  这也的确是事实
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  that Athens was severely deforested
  雅典人数个世纪以来
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  in the course of the centuries,
  一直在大量开采木材
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  so that Plato could comment on
  所以柏拉图才会描述