1. In the thousands of years of circulation, there must be some phenomena such as losing words and pages; There are many manuscripts in ancient times, and it is inevitable to make mistakes;
2. Various printing workshops may also make mistakes;
3. Scholars who compile books are likely to change according to their own likes and dislikes;
4. Scholars of various schools are likely to add or delete according to their personal understanding;
5 "Yongle Grand Ceremony" in Ming Dynasty and "Si Ku Quan Shu" in Qing Dynasty were also greatly changed in the editing process for the benefit and needs of this dynasty;
6. At the beginning of the Han Dynasty, Shangshu was lost. Based on the memory of an old Confucian "Fusheng", 28 pieces of Shangshu were recorded orally, which was called "Jinwen Shangshu" in history. I lost all my teeth, and my pronunciation was unclear. In addition, my dialect was not very accurate.
7. There are many counterfeiters in history. According to legend, at the beginning of the Western Han Dynasty, King Lu expanded the garden and tore down the wall of Confucius' house. Thirteen ancient books were found in the wall, which was a forged story. In the Eastern Jin Dynasty, another man named Mei Yi also forged several articles. From the Song Dynasty to the Qing Dynasty, it took more than 7 years to make a final decision.
8. There are more and more Chinese characters, and it is not surprising that they were often borrowed in ancient times.
9. Individuals also have different habits of using words.
In the end, typos and interchangeable words are inevitable. As long as they are clear, they will not affect reading and learning.