有这样一个故事:一位教育家请了三个学生,让他们一起做个游戏。他将三个系着绳子的小铅锤装入瓶子,并请孩子们拿着绳子的另一端,他要求在他数到“3”的时候,瓶子里的小铅锤能全部顺利的取出,瓶口很窄,一次只能上来一个人。一个孩子低声对同伴说:“等会儿,你第一,你第二,我最后。”结果,当教育家“3”字刚出口,三个学生已经顺利地把小铅锤一个一个提了出来。这位教育家非常激动说: There is such a story: an educator invited three students, let them play a game together. He put three small plumb bobs into the bottle and asked the children to hold the other end of the rope. He demanded that the small plumb bob in the bottle go smoothly when he counted “3” Remove, the bottle is very narrow, only one person up at a time. A child whispered to his companion: “Wait a minute, you first, you second, I last. ” The result, when the educator “3 ” just export, three students have successfully put the small lead Hammers one by one raised out. This educator is very excited and said: