Introduction to Pu'an Bridge: Pu'an Bridge, also known as Xiaodongxi Bridge, is a bridge that reflects the diligence and studiousness of Tongli people. It was first built in the first year of Zhengde in the Ming Dynasty (1506). On the stone wall on the west side, there is a very eye-catching couplet carved on it. The upper couplet is "A moonlight contains shadows" and the second couplet is "The sound of books on both sides of the Taiwan Strait is connected." Chart song".