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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  or remote parts of the world.
  或者世界上一些偏远的地方推广
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  An oral polio vaccine was developed
  一个名叫萨宾的人研发出了
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  by a man named Sabin.
  一种口服小儿麻痹症疫苗
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  What he did was took the polio virus into the laboratory
  他将脊髓灰质炎病毒带到实验室
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  and tried to make an attenuated form of it,
  并且尝试构建该病毒的减毒形式
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  that is, "Can I get the virus to mutate in ways
  他想知道 可以不改变病毒的物理结构
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  that it doesn't change its physical structure much
  同时使这个病毒进行变异吗
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  so it still looks like active polio
  即让它看上去像活的脊髓灰质炎病毒
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  but it changes its disease causing properties,
  但却改变其致病属性
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  so it changes disease causing properties
  也就是说在改变其致病属性的同时
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  without making it non-immunogenic?"
  保留其免疫源性
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  He produced an oral polio vaccine from an attenuated virus.
  他利用减毒病毒制得口服小儿麻痹症疫苗