来自《耶鲁大学开放课程：博弈论 第9集 第9集》

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  and that's this number we worked out already.
  这个数字我们已经算出来了
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  So this number here can come down here, 1.
  我们把结果1带入到这里
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  And 4/5 of the time he's playing B against Q,
  4/5的概率他获得B对Q的预期收益
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  in which case his expected payoff was ?,
  此时的预期收益是?
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  so this ? comes in here.
  把?代入这里
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  Everyone okay so far, how I constructed it so far?
  大家都看懂了吗
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  Is this podium in the way of you guys, are you okay?
  这个讲台有点阻碍视线 你们看懂了吗
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  Let me push it slightly.
  我把它移开吧
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  So the total here is what?
  最后的结果是多少呢
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  It's going to be 1/5 of 1 plus 4/5 of ?.
  是1×1/5+?×4/5
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  4/5 of ? is 2/5, so I've got a total of 3/5.
  ×4/5是2/5 因此最后结果是3/5
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  So the total here is 3/5.
  最后的结果是3/5