That's a good question. The handling of official documents in ancient China was similar to that now, and they were all annotated by people. However, China has a unique seal culture in ancient times, so the official document only needs to read the chapter. And each leader also has his own secretarial team. For example, the county magistrate, the director of the county public security, fire, culture and construction bureau, and the chief justice also have their own secretarial team, such as the second door. The emperor also has secretaries such as Zhongshu Province and Shangshu Province. They attached their opinions to official documents in various places and gave them to the emperor for review and annotation. Because there were too many official documents, the emperor also got a big secretary to help him read them-the prime minister. Later, the Ming cabinet developed the secretary to the extreme.