有这么一个故事:一个商人经过一片沙漠时迷了路,面对浩瀚无边的沙漠,他不知道该往哪边走。但他认为两点之间最短的距离是直线,只要走直线,不走弯路,就一定会走出沙漠。为了走出沙漠,他在原地做了一个记号,开始朝东走。走了不多久,他觉得不对,以为自己走了弯路,又返回原地。接着往南走,不多久又折了回来。再接着往北走,走了半天仍然不见一个人影,以为又走错了,还是回到了原地。接下来,他又尝试了西南、西北、东南、东北,几乎每一个方向都试过了,他还是回到了原地。这 There is such a story: a businessman lost his way through a desert, in the face of vast boundless desert, he did not know where to go. However, he believes that the shortest distance between two points is a straight line, as long as the straight line, do not detours, it will certainly out of the desert. To get out of the desert, he made a mark in place and started to go east. Not long gone, he felt wrong, thinking that they have detours, and returned to the place. Then go south, soon folded back. Then go north, still a long time gone without a figure, that is wrong, or returned to the place. Next, he tried again southwest, northwest, southeast, northeast, tried in almost every direction, and he still came back. This