古希腊哲学家芝诺,为了勉励学生刻苦学习,曾以大小两个“圆圈”作比喻,把大圆的面积比作自己的知识,小圆的面积比作学生的知识,并对学生说:“大圆的周长比小圆长,因此我无知的范围比你们大,更感到需要学习啊!”芝诺的“圆圈说”,印证了中国的一句古话:“学然后知不足。”学然后 The ancient Greek philosopher Zeno, in order to encourage students to study hard, once used the metaphor of two “circles” of the size to compare the area of ​​a great circle with his own knowledge. The area of ​​a small circle is likened to the knowledge of a student and said to the student: The circumference of the big circle is longer than the small circle, so my scope of ignorance is bigger than yours and I feel more need to learn! “Zeno’s” Circle Theory “confirms an ancient saying in China:” Learn and Learn. "Then