Living in Guangdong Mansion, you can see the Memorial Hall of Zhongshan. The main building is very magnificent. It is amazing that the designer has skillfully applied the structural principle of architectural mechanics and adopted the steel frame and reinforced concrete mixed structure. There is no column in the building space with a span of 71 meters. On the platform of the inner lobby, there is Mr. Sun Yat-sen's will, which touches the blood and dedication of our ancestors.