Briefly describe three periods in the three cycles of China's history.

The historical evolution of each cycle shows an incomprehensible mechanical contract in its time and cause and effect, so the last cycle is exactly the same as the next. As Dr. Li said, a considerable period of each cycle is about the beginning of an appropriate period of cultural development. There is always a great project, but it will be unfortunately destroyed every time.

In the first cycle, there were the magnificent Qin Shihuang Great Wall in Wan Li and the magnificent Epang Palace. Once upon a time, Epang Palace was destroyed by a fire, which lasted for March in the county. In the second cycle, the Sui Dynasty dug a canal, and Emperor Yang Di also built a magnificent detached palace, which was extravagant and wasteful. In the third cycle, there was the reconstruction of the Great Wall, and the form of this reconstruction was left to today's face. During the reign of Emperor Yongle in the Ming Dynasty, several new canals were dug and sluices were built. The famous Yongle ceremony is also a great achievement in this period.

According to Dr. Li, the history of China can be easily divided into periods every 800 years. At the beginning of each cycle, a short-lived royal family ended the continuous civil war with strong military strength, and unified China, which was followed by four or five hundred years of peace and prosperity. After this period, the dynasty changed again, and the ups and downs of the civil war began again, which immediately moved Kyoto from north to south.

Then there was a confrontation between the north and the south, and the situation became more and more sinister. Finally, he fell into the abyss of alien rule and ended this cycle. This is a cycle, repeating the past cycle, China's reunification and recovery of sovereignty, and this period will create new glories in culture.