1. In the spread of thousands of years, there are bound to be phenomena such as falling words and pages; There are many ancient manuscripts, and mistakes are inevitable;
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 from different schools are likely to add or delete according to their personal understanding;
In the process of editing, Yongle Dadian in Ming Dynasty and Sikuquanshu in Qing Dynasty were greatly changed for the benefit and needs of this dynasty.
6. In the early Han Dynasty, Shangshu was lost. According to the memory of an old Confucian "Fu Sheng", 28 pieces of Shangshu were recorded orally, which was called "Jinwen Shangshu" in history. I lost all my teeth and couldn't pronounce clearly. Besides, my dialect is not very accurate.
7. There are many people who make fakes in history. According to legend, at the beginning of the Western Han Dynasty, King Lu expanded the garden and pulled down the wall of Confucius' House. Ancient prose 13 articles were found in the wall, which is a forged story. In the Eastern Jin Dynasty, another man named Yimei also forged several articles. From the Song Dynasty to the Qing Dynasty, it took more than 700 years to finally decide.
8. There are more and more Chinese characters, so it is not surprising that they were often borrowed in ancient times.
9. Individuals also have different vocabulary habits.
Finally, typos and interchangeable words are inevitable. As long as it is clear, it will not affect reading and learning.