来自《耶鲁大学开放课程：生物医学工程探索 第10集 第10集》

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  for a variety of reasons.
  由于各种原因均失败了
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  One is the resources that are needed in order to do this.
  一是因为做成这件事所需要的资金
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  The other is that some places
  另一个原因是 一些疾病发生地区
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  where the disease occurs the governments are not stable,
  当地的政局不那么稳定
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  or there might be civil unrest or civil wars
  或者有动乱和内战
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  and that makes it very difficult to orchestrate giving vaccines
  当在一个国家内发生许多
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  when there's other things happening in the country
  突发应急事件的时候
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  that are of more immediate concern.
  疫苗的分派发放会变得非常困难
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  And there are some communities
  有一些社会团体
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  that are frankly suspicious of Western medicine
  对西药是极其怀疑的
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  and don't want people to come in with their modern approaches
  他们不欢迎带来现代方法的人
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  and feed things to members of their community.
  也不愿给民众吃什么东西