来自《耶鲁大学开放课程—哲学：死亡 第19集 第19集》

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  And actually
  而且实际上
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  you can get other weird combinations.
  你还可以得到其它各种组合
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  You go to the dentist and he pokes you. He says,
  你去看牙 牙医戳着你的牙问
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  "Does this hurt? Does that hurt?"
  "这里疼吗 那里疼吗"
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  in order to try to figure out where there's gum disease.
  以此来确定牙龈发炎的地方
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  And the pain that he causes is intrinsically bad.
  他引起的疼痛本身是件坏事
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  In and of itself it's bad.
  本质上的坏事
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  Yet, for all that, it's being useful there.
  但尽管如此 它还是有用的
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  It's providing a means of deciding where the gum has decayed.
  它作为一种手段帮助诊断牙龈炎
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  And that allows the dentist to improve your gums,
  帮助牙医治愈你的疾病
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  which avoids more pain down the road.
  这样你以后就不会再牙疼了
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  So the pain you're suffering
  所以你现在忍受的疼痛