来自《耶鲁大学开放课程：心理学导论 第4集 第4集》

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  The difference between ratio
  比率强化意思是
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  is a reward every certain number of times somebody does something.
  间隔一定比例才给予奖励
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  So, if every tenth time your dog brought you the newspaper
  每当你的狗为你拿十次报纸
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  you gave it hugs and treats;
  你就抱抱它 给它奖励
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  that's ratio.
  这便是比率强化
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  An interval is over a period of time.
  时间强化则是间隔一定时间才给予奖励
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  So, if your dog gives you--
  如果你的狗
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  if your dog, I don't know, dances for an hour straight,
  每当你的狗连续跳舞一小时
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  that would be an interval thing.
  你才会奖励它 那这就是时间强化
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  And fixed versus variable speaks to
  固定与变化则是相对于
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  whether you give a reward on a fixed schedule,
  你是否根据固定时程给予奖励而言的
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  every fifth time, or variable,
  每五次就给予奖励 或者是变化的