来自《耶鲁大学开放课程：生物医学工程探索 第9集 第9集》

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  then at that site where you injected it,
  然后在你注射的地方
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  you would get a lesion that looked like a smallpox or cowpox lesion.
  你会看到像天花或者牛痘一样的病变
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  And it would go through these same phases that I described before.
  然后经过我之前描述的过程
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  And it would,you'd get a clear blister-like region,
  你会看到一个透明的像水泡一样的地方
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  it would turn pustular.
  它会变成脓疱
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  Eventually you develop a scab, as it healed,
  愈合之后会变成一个疤
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  and then it would--and then the scab would fall off,
  这个疤后来会脱落
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  and you'd be left with a scar.
  你身上会留下疤痕
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  But what if instead of taking the fluid from a cow,
  但假如不从奶牛那儿取得脓液
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  I inoculated--he inoculated me, let's say,
  假设说是从他那里接种
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  and waited until I had the lesion at the right stage,
  等到病变程度合适
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  then took some of my fluid and gave it to
  然后把我的脓液给