So get to sample Q2, you essentially sample X1 from this distribution, square that value, sample X2 from the same distribution, essentially, square that value, and then add the two.

因此，获取样本 Q2， 本质上是从该分布中对 X1 进行采样，对该值求平方， 从同一分布中对 X2 进行采样， 从本质上对该值进行平方， 然后将两者相加。