And then we compare those two probability estimates.

然后我们比较这两个概率估计。

This is just a definitional matter, I say a billion dead, or a reduction of world GDP by 50 percent, but depending on what you say the threshold is, you get a different probability estimate.

这只是一个定义问题， 我说十亿人死亡，或者世界 GDP 减少 50%， 但是根据你所说的阈值， 你会得到不同的概率估计。