遡流穷源

Explanation: Originated upstream to find the place. The root metaphor for something. Mingxie Zhao Zhe, "something the Department of the Second Five Miscellaneous ZU": "Spring and Autumn Period, the good name of who has the public Zhong Lu, Xu Chen Jin has, Zhengyou Zi Yu, Yan said no other thinkers. Soo current poor source, if the Sri Lanka difficult also. "