So, some societies, for subtle environmental reasons, are more fragile than others. And then finally, another generalization. I'm now teaching a course at UCLA, to UCLA undergraduates, on these collapses of societies. What really bugs my UCLA undergraduate students is, how on earth did these societies not see what they were doing?
所以说，有一些社会，由于这些微妙的环境因子， 比其他社会更加脆弱。最后， 我将阐述第三个共识。 因为目前不才正执教于 加州大学洛杉矶分校，给那里的本科生们讲授关于社会崩溃的课程。 课堂上，最让我的这群学生们迷惑不解的事情是， 这些社会怎么就没有发现他们在自寻死路？