Introduction to ancient fir trees: was planted by Zhu Xi himself when he returned to his hometown to visit his tomb. He originally planted 24 trees, which means 24 filial piety. There are 16 trees now. More than 800 years ago, they are still growing vigorously. The tallest one is 38.7 meters. , the thickest bust is 3.07 meters, and is known as the "King of Jiangnan Cedars".