At the entrance of Sun Yat-sen's Mausoleum, there is a tall granite archway with the word "fraternity" written by Dr. Sun Yat-sen in gold. The origin of the word "fraternity" has a long history with Yu Youren, a veteran of the Kuomintang. Yu Youren 1904, aged 26, angered Cixi by advocating revolution and satirizing current politics with poems. The Qing court then ordered the arrest of this "juren". As a result, Yu Youren had to leave his hometown and fled to Shanghai alone under the pseudonym of Liu. During his stay in Shanghai, he experienced reading, running a school and running a newspaper. 1September, 906, Yu Youren went to Japan in the name of investigation service. Under the introduction of friends, Yu Youren and Sun Yat-sen met. Since then, Yu joined the League with Sun Yat-sen and became Sun Yat-sen's close comrade-in-arms ..1965438+In February 2002, Yuan Shikai forced Sun Yat-sen to resign as president, and soon after, Yu Youren also resigned as the second minister of the Ministry of Communications. Before Sun resigned, Yu Youren visited his close comrade-in-arms. Sun Yat-sen has deep feelings for the Special Committee, so he specially presented two gifts as a souvenir to show his sincere revolutionary friendship. His gift is: Sun Yat-sen wrote a picture of nave, that is, the word "fraternity"; Another gift is a cannonball, which has far-reaching significance. 1926, 1 In June, when Sun Yat-sen's body was in Feng 'an, Zhongshan, the eastern suburb of Nanjing, the word "fraternity" written by Dr. Sun Yat-sen appeared on the granite archway at the entrance of Sun Yat-sen Mausoleum. Then, at the beginning of the ten-year turmoil that broke out in the 1960s, at the stage of "breaking the four old things" known as the "Great Proletarian Cultural Revolution", the "rebels" took "universal love as a classless attribute", which was contrary to the political line of "taking class struggle as the key link", so they were included in the "four old things" and had to be broken, and were labeled as "breaking the old things and establishing the new ones". In order to prevent the building of Bo 'ai Square from being damaged, Sun Yat-sen Cemetery Management Office, the predecessor of Sun Yat-sen Cemetery Management Office, organized workers to set up scaffolding, invited masons, and gently chiseled the word "Bo 'ai" written by Dr. Sun Yat-sen on the forehead of the square with a steel chisel. Since then, this stone archway, designed by the famous architect Mr. Yang Tingbao and made of Macao granite, has lost its name, which lasted for 13 years. After the downfall of the Gang of Four, with the approval of National Cultural Heritage Administration, in 1979, the photo negative of Pok Oi Plaza was found in the cultural relics archives, and projected on the paper with the same size as the ground archway by the photo magnifier in Sun Yat-sen's photo agency, and the word "Pok Oi" was drawn. Please ask Master Zhang Fasong, a stonemason in Doucun, the eastern suburb, to carve it carefully. Since then, Aibo Square has been restored to its original appearance.