And then think about this: Why can't I get a cell phone signal in San Francisco?  How is this possible?  It makes no sense.  We consistently underestimate what criminals and terrorists can do.
然后再想想这个： 为什么我在旧金山收不到手机信号呢？ 这怎么可能呢？这完全没有道理啊。 我们一直低估了 罪犯和恐怖分子能做到的事情。