But many low probability events cumulate to a substantial risk. 其实，许多低概率事件积少成多，足以构成重大风险。
Nobody knows how much probability there is that the unrecoverable and fatal accidents with a tiny possibility happen to you or me. 谁知道那不可修复不能残喘的小概率事件有多大可能就偏偏发生在他自己身上呢？
