Introduction to the Guanmen: There are two couplets at the entrances of the left and right Guanmen: at the right mountain gate, the upper couplet is "Shanmao is long, long, long, long, long~ long; the second couplet is: Xi Sanyuan, ride, ride, ride, ride, ride ~Cheng. At Zuoshan Gate, the first couplet reads: Xiayou Chao Chao Chao Chao ~ Chao; the second couplet reads: Yun Peng Guan Guan Guan Guan ~ Guan. The broad philosophy of life is summarized, and different sentences are used to express different contents. It has been interpreted differently for thousands of years, but none of them has convinced the public. It is known as "the best strange couplet in the world".