青出于蓝而胜于蓝

Indigo Blue is Extracted from the Indigo Plant but is Bluer than the Plant It Comes from

数学课上解一道几何证明题时,老师用传统思维模式证明出错,学生另辟蹊径寻求解题新思维,求得科学解答。一个课堂小插曲,引发一个道理:青出于蓝而胜于蓝。

This paper describes the solving process of a geometry problem：the teacher works out a wrong result with traditional thinking mode while students come up with a scientific result with new method and new thinking.This small episode of a class proves a truth：Indigo blue is extracted from the indigo plant but is bluer than the plant it comes from.