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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  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
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  sometimes on the third time,
  有时候在第三次上给予奖励
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  sometimes on the seventh time, and so on.
  有时候则在第七次上给予奖励
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  And these are--There are examples here
  这里有些例子
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  and there's no need to go over them.
  但我们没必要去看了
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  It's easy enough to think of examples in real life.
  我们很容易在现实生活中找到例子