谷超豪是中国著名数学家,他上课轻松幽默且深入浅出,再深奥的学问都能被他说得通俗易懂。一次,谷超豪问学生:“你们都知道,在墙上固定一条长棍子,至少需要在两端各钉一个铁钉,但是你们能想起来这是为什么吗?”“这……”学生们你看看我,我看看你,没人能说出来。“‘两端各钉一个铁钉’是常识,其中包含的学问是 Gu Chaohao is a famous mathematician in China. He has a relaxed and humorous attitude in class and can easily understand what profound knowledge is. Once, Gu Chaoying asked the students: ”You all know that fixing a long stick to the wall requires at least one nails at each end, but can you remember why?“ You look at the students, I see you, no one can say it. ”’Nails nails at both ends’ is common sense, which contains the knowledge is