两个人在一条风景优美的路上散步。他们的幸福度取决于两个方面:一是欣赏风景所带来的愉悦;二是相对位置所带来的快乐,即领先者更幸福,而落后者则不快乐。一开始,两人都走得很慢,A走在B前面。从欣赏风景角度,两人都得到了精神上的愉悦,很是幸福;而从相对位置来讲,A快乐,而B不快乐。为了赶上A,B加快了步伐;相应地,A也加 Two people walking on a scenic road. Their happiness depends on two aspects: one is to enjoy the pleasure brought by the scenery; the other is the happiness brought by the relative position; that is, the leader is happier while the backward ones are not happy. At the beginning, both of them walked slowly, A walked in front of B. From the perspective of enjoying the scenery, both of them got the spiritual pleasure, very happy; from the relative position, A happy, and B is not happy. In order to catch A, B accelerated the pace; accordingly, A also added