So even though we're arguing that C is not evolutionarily stable

所以尽管我们证明了C不是进化稳定策略
because it's invaded by B,

因为会遭策略B的入侵
it doesn't have to be the case

但是这并不意味着
that the successful mutant is itself evolutionarily stable.

成功的突变本身就是进化稳定的
So in this particular example

所以在这个博弈里
the invader, namely B, is itself not evolutionarily stable.

突变B本身不是进化稳定的
Nevertheless, it doesn't die out but it invades the population of C's.

反正它不会灭绝而且它会入侵C
But there's a second observation I want to draw off this one,

但从中我们还能总结出第二条结论来
hoping there's a bit of chalk here, not finding it,

我得找一根粉笔
there's a second observation I want to draw here, what do we observe?

那第二条结论是什么呢
What else is true about both C and B?

关于B和C还有什么结论呢
So what's true about everyone playing C or everyone playing B?

大家都采用C或者都采用B有什么问题