有一则关于两个哲学家讨论外星生命的故事颇为有趣:一个哲学家说:“如果外星人存在,那么他们的智力水平就有可能超过我们人类,因此我们可以预期并相信,他们已经在悄悄间访问了地球———可是,他们有没有留下什么痕迹呢?”另一个哲学家俯身过来对他耳语道:“嘘!在这里我们把他们 There is a story of two philosophers discussing alien life quite interesting: A philosopher said: “If there are aliens, then their intelligence level may exceed our humanity, so we can expect and believe that they have Quietly visited the earth --- but did they leave any traces? ”Another philosopher leaned over and whispered to him:" Hush! Here we put them