On this day, 42 years ago, on August 28, 1983 (July 20, 1983 in the lunar calendar), the Sun Yat-sen Research Society was established. The Sun Yat-sen Research Society of Zhongshan City was established on August 28, 1983. It is the earliest academic mass group established in the country to study Sun Yat-sen. In the 30 years since its establishment, it has been established with extensive support from the municipal party committee, municipal government and all walks of life. The conference gas station has grown and grown continuously, with more than 200 members. The research association adheres to a long-term, local and realistic policy of organizing the association. Its main work is to organize members to study and study Sun Yat-sen's thoughts and theories, publicize the revolutionary and patriotic deeds of Sun Yat-sen and his contemporaries from Xiangshan, collect and collate Sun Yat-sen and his revolutionary followers. Local historical data, contact descendants and relatives of Sun Yat-sen and his revolutionary comrades at home and abroad, hold or participate in academic seminars and commemorative activities, etc. At present, many publications such as "News of the Sun Yat-sen Research Society","Journal of the Sun Yat-sen Research Society", and "Selected Works of Sun Yat-sen Research" have been published. A precious recording of Sun Yat-sen's Cantonese speech 100 years ago comes from a recording recorded for Sun Yat-sen by the China Evening News on May 30, 1924. The speech sounded like the earnest teachings of a loyal and kind elderly man. This was the true accent of the founding father. It was spoken in Cantonese with the accent of Zhongshanshiqi. Let's listen to the Cantonese pronunciation almost a hundred years ago. Sun Yat-sen gave a Cantonese speech on "National Salvation Policy" for 7 minutes!