来自《耶鲁大学开放课程：1600年后西方社会的流行病 第7集 第7集》

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  and you were only chosen for inoculation if you were healthy
  只有体质健康强壮的病人才会被选为
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  and robust.
  病液来源
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  There were, however, problems.
  不过这种方法也有问题
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  Inoculation was also a partially flawed procedure.
  接芽术其实在某种层面上是有瑕疵的
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  All too often, despite all precautions,
  经常出现这样的情况 尽管已经做了
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  it failed to produce the desired mild infection,
  周全的准备 接芽还是没能按预想
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  but led instead to severe illness and death;
  引发温和天花 相反直接使人生病死去
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  and invariably it caused a month
  而且不论哪种情况下 被接种者都会
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  or two of immense suffering.
  受一两个月的病痛折磨
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  It was also costly, since physicians insisted on a
  而且 因为医师们坚持要在接种前
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  lengthy period of preparation
  进行长时间的准备工作
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  when they were performing the procedure.
  所以接种的花费不菲