来自《耶鲁大学开放课程：博弈论 第9集 第9集》
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Why is it the case that if Serena guesses wrong为什么如果塞丽娜猜错了方向 -
Venus doesn't win 100% of the time?维纳斯不能100%得分呢 -
Anybody? Perhaps we can get a show of hands, get some mikes up.谁知道吗 有人举手吗 准备好麦克 -
Why isn't it 100% here? Somebody? Patrick?为何不是100% 帕特里克你说一下 -
Wait for the mike.请把麦克递给他 -
Sometimes she hits it out of bounds when she serves.因为有时她也可能把球发到界外 -
Right, this isn't even a serve,好的 这不是在发球 -
this is a passing shot but the same is true.这是打穿越球 但道理是一样的 -
So sometimes you're successfully going to hit it past Serena有时你成功把球达到了塞丽娜的一侧 -
but the ball is going to sail out.但球却出界了 -
So that happens 10% of the time here这种情况下出界的概率是10% -
and 20% of the time here.而这里出界概率是20%