So what I'm going to do is I'm going to clean these boards

我先把这几块黑板擦干净
and I'm going to start showing an example.

然后列举一例
Again don't panic,

大家不必慌张
I think a lot of people at this part of the class have a tendency to panic,

我觉得有些人总是惊慌失措
because it's a new idea, it seems like a lot of math around.

因为这个新概念好像需要很多数学知识
None of it's very hard math, it's all kind of arithmetic.

这只不过是算数问题而已很简单的
It's just this idea of not panicking.

大家没理由慌张的啊
So the example I want to look at is going to be from tennis,

我们要研究的案例与网球有关
and I'm going to consider a game within a game,

我把它看成是博弈中的博弈
played by two tennis players,

它在两个网球选手之间展开
and let's call them Venus and Serena Williams.

她们分别是维纳斯和塞丽娜·威廉斯
So Venus and Serena Williams.

维纳斯和塞丽娜·威廉斯