both using the class and using the board and figuring out average payoffs.

即有关在座各位和板书平均收益的内容
This is an ugly definition.

这个定义真难看
Everyone agree this is kind of ugly?

大家是不是都同意这个定义很难看啊
So now what I'm going to do is

下面我要做的是
I'm going to give you an entirely different definition.

给大家写一个完全不同于这个的定义
It's also going to be ugly but a little bit less ugly.

它也不好看但比这个强点
So think of that as Definition 1, and it came from biology,

把上面的生物学定义就叫定义1好了
it came from this paper in 1972.

它源于1972年梅纳德·史密斯等
I think it was in Nature by Maynard Smith and co-authors.

发表于《自然》杂志上的一片学术论文
Think of this other definition, that's coming out of Economics.

我们再来说一下经济学的定义吧
So Definition 2,

把它称为定义2好了
a strategy ?... I should have had the same qualifier,

我应该把前面的限定成分加上