Zhuangzi is an ancient book that illustrated philosophical principles through parabolical images.

《庄子》之书，以寓言地步来证明哲学道理。

Heat equation is the most typical one of parabolical equations, which describes many physical-phenomenas, such as conduction, diffusion. Etc.

如描述热传导、扩散等物理现象的热传导方程就是最典型的抛物型方程。