Modern Japanese scholar Hunan Naito once wrote four four-line poems, which respectively described the four most precious treasures in his collection of more than 30,000 rare ancient books: Mao Shi, a short version of Shaoxing in the Song Dynasty, Shuo Wen Jie Zi in the Tang Dynasty, A Biography of Chunqiu Classic in the Heian Dynasty in Japan, and Historical Records in the Northern Song Dynasty. There are some sentences in the poem, such as "Strange articles only belong to Cao" and "Scholars are proud of it". Today, I still feel that I am sitting in a lonely book, and I am innocent of the conceit of the king of the South. The four rare books mentioned above have all been recognized as "Japan's national treasures" by the Ministry of Education, Culture and Sports. Among them, except the fragments of Chunqiu Jingzhuan Ji Jie written by Chao Pingan, the other three books are rare ancient books and rare treasures in China.