来自《耶鲁大学开放课程：环境政治与法律 第1集 第1集》

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  so that exposure becomes more persistent.
  所以暴露变得更为持久
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  The danger to health is increasing.
  对健康的危害与日俱增
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  There's an interesting correlation,
  有个有趣的关联
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  and I'm not saying that it's a causal relationship,
  我并非指因果关系
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  an interesting correlation between the increasing number
  在美国和其他发达国家的不同地区
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  of these finer particles with rising rates of respiratory illness
  越来越多的更细微的颗粒
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  in the United States
  与呼吸道疾病越来越高的发病率
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  and in different parts of the industrialized world.
  形成了一个有趣的关联
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  So why might that be?
  为什么会有这样的关联呢
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  Well, let me give you one analogy.
  让我来做个类比
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  If you thought about an aquarium
  想象一个鱼缸
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  and you fill that aquarium up,
  不管鱼缸的大小