来自《耶鲁大学开放课程：博弈论 第9集 第9集》

• 
  
  is to lean to the left.
  仍然是防守左边
• 
  
  So it's still the case that the best responses do not coincide,
  因此最佳对策仍然没有交集
• 
  
  there is still no pure strategy equilibrium.
  仍然不存在纯策略纳什均衡
• 
  
  What we're going to do of course is
  接下来我们就要寻找
• 
  
  we're going to find a mixed strategy equilibrium,
  混合策略纳什均衡了
• 
  
  but before we do so, let's think about this intuitively.
  但在此之前 用直觉判断一下
• 
  
  Let's see if we can intuit an answer.
  看看你们能不能凭直觉说出来
• 
  
  I'm guessing we can't, but let's see if we can intuit an answer.
  我猜可能不行 但我们试试吧
• 
  
  So Serena has improved her backhand volley,
  塞丽娜反手截击的水平有所提高
• 
  
  and hence when she reaches it she gets it in more often.
  这样她接反手球时得分的概率更大了
• 
  
  So one effect, you might think,
  首先你们能想到的
• 
  
  is what we might want to call a direct effect
  应该是人们常说的直接影响