哥伦布立鸡蛋，为什么难住大臣？

Columbus once talked with proud ministers. 哥伦布曾和一些骄傲的大臣聊天。 He asked them to stand an egg up. 他请他们把一个鸡蛋立起来。 Everyone tried, and no one could do it. 大家都试了，谁也立不住。 Columbus pressed the egg on the table. 哥伦布把鸡蛋在桌上轻轻一磕。 The egg sat there, standing still. 鸡蛋立住了，稳稳当当。 The answer is easy once you see it. 办法一旦点破，简单得很。