来自《耶鲁大学开放课程：环境政治与法律 第2集 第2集》

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  a story about chemicals moving in the marine food chain.
  化学物质进入海洋食物链的问题
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  You've heard about mercury in tuna.
  大家听说金枪鱼体内有汞
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  You've probably heard about mercury in shark
  可能也听说过鲨鱼和其他大型食肉鱼类
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  and large predatory fish.
  体内有汞
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  But you probably haven't heard about mercury in the array of
  但你可能没有听过说加勒比海中
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  tropical fish that exist in the Caribbean seas.
  一群热带鱼体内也发现有汞
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  Well, that's because they haven't been studied.
  因为并未对它们进行过研究
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  People tend to look at the chemicals in the larger fish.
  人们习惯关注大型鱼类体内的化学物质
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  They tend to avoid the study of this set of tropical fish,
  而常常避开对这些热带鱼类的研究
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  because these don't comprise a large proportion of the U.S.
  因为它们在美国日常饮食中
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  average diet, or rather high-income nations
  占比不大 确切地说 愿意投资
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  that would fund this kind of research
  这类研究的高收入国家