来自《耶鲁大学开放课程：心理学导论 第10集 第10集》

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  if the thing is in your blood
  如果这种物质在你的血液里的话
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  the test will go "boom."
  测试就砰的一声
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  If you have it, it will tell you you have it.
  只要你有它就会告诉你
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  It doesn't miss.
  不会出错
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  On the other hand, it's not perfect.
  但同时 它并不完美
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  It has a false positive rate of five percent.
  它有百分之五的误诊率
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  So, if you don't have the disease,
  所以 如果你没得这种病的话
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  five percent of the time the test will say you have it.
  有百分之五的概率它会说你有
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  So, if the test says you don't have it,
  所以 如果测试说你没得
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  you're fine.
  那就没事
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  But if the test says you have it,
  但是如果它说你得了的话
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  maybe you have it but maybe it's a false positive.
  也许你得了 也许仅仅是个误诊