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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  Well, this shows what happened in the period after
  这表明了 疫苗在一九五四年
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  this vaccine was introduced into the general population
  引入大众后的一段时间内
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  so that would have been in 1954.
  发生了什么样的情况
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  This is a complex slide,
  这个幻灯片很复杂
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  so let me show you what it is.
  我给你们解释一下
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  The Salk Vaccine is also called the Killed Polio Vaccine,
  索尔克氏疫苗也叫灭活脊髓灰质炎疫苗
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  and some people call it KPV, also sometimes called
  有人将其简称为KPV 有时也被称作
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  Inactivated Polio Vaccine, IPV,
  失活脊髓灰质炎疫苗 简称IPV
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  but this is the vaccine I just talked about produced by Salk.
  这个疫苗由索尔克研发 刚才讲过他
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  After the clinical trial
  临床试验结束后
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  it was rapidly introduced into the population.
  该疫苗迅速地应用于大众
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  This curve here with the square shows you
  这个带方形的曲线图显示了