来自《耶鲁大学开放课程：有关食物的心理学、生物学和政治学 第12集》

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  The second is secondary prevention,
  第二是中级预防
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  which focuses on early detection of the disease.
  重点在于疾病的早期发现
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  So you're not preventing the disease,
  不是预防疾病
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  but you're catching people who have it
  而是找出感染者
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  and then you try to prevent its progression.
  进而阻止疾病的发展
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  And then tertiary prevention is try to reduce the impact
  接下来的三级预防是努力减少疾病的影响
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  and the complications of disease.
  及并发症的发生
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  Now as much possible, you'd like to see primary prevention occurring.
  我们都很希望 初级预防就起作用
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  That's not really always possible.
  这个不是总是可能的
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  But one thing you could do for example
  但是对于传统传染病
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  with traditional infectious diseases,
  有一件事我们是可以做的
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  is you can take people who have the disease and then quarantine them,
  我们可以隔离患者