If he's using Fact A,

如果他用A方案
he should not shoot.

他不应该投掷
Alternatively, he could think that Chevy is going to shoot tomorrow,

那么如果他认为沙威下一轮要投出
in which case he uses Fact B,

他就会用B方案
and what does he do?

那么他会怎么做呢
He adds up his probability, Patrick's probability of hitting today

他会算一算自己击中的概率
plus Chevy's probability of hitting tomorrow:

加上沙威下一轮的失误率
he asks is that sum bigger than 1, and he concludes, no.

求和大于1么不应该是小于1
So we have no shot here and no shot here,

那么我们不应该投出海绵
and notice that both of those arguments were dominance arguments.

注意一下两个都是优势策略
In each case, whether Chevy thought

无论沙威认为帕特里克
that Patrick was going to shoot tomorrow

下一轮是投出还是不投