What is the allusion of the descendants of the dragon?

It is said that when he came down to earth to control water, he saw that people on the ground were forced to flee around by floods, unable to hunt and farm, and almost unable to survive. But for such a large-scale flood, the only way Kun could think of was to contain it. Seeing that these floods kept breaking through his dam, Kun couldn't stand the feeling of being helpless when watching ordinary people suffer. So, he decided to steal the treasure of heaven, "rest soil"-a kind of soil that will continue to grow, so that the containment of herring will no longer fail. With the help of "rest land", people will leave barren hills and caves and start their lives again on the ground. Gun is very happy to see that these mortals can live and work in peace and contentment because of his help. When he was about to return to his post, Yao, the Tianshi at that time, was very angry that the "rest land" was stolen, so he took it back and let the flood ravage the ground again. The original scene of living and working in peace and contentment turned into Wang Yang, and the gun was helpless. Not only could I not save these mortals, but I was also killed by Yao with lightning ("Yao was killed in Yushan yesterday ..."-"Seventeen Years of Zuo Zhuan Zhao Gong"). The gun that failed in water control is full of resentment. After being chopped by lightning, he not only died unsatisfied, but also his body did not rot three years later. "Shan Hai Jing Hai Nei Jing" Guo Fu quoted "Returning to Tibet for begging"; "At the age of three died won't be rotten. With Wu Dao as the deputy, it can be used. " The history of Tao, quoted by later generations as "going to Tibet and begging for food"), ended this terrible flood by dredging. During this period of water control, on the one hand, he used dragons as the power of water gods to solve many problems, on the other hand, he subdued many evil dragons who only made waves and turned to help him control water, such as the "dragon chopping platform" and "staggered gorge" in the Three Gorges of the Yangtze River. Then the Xia Dynasty was established, which was not only the first dynasty in the history of China, but also a clan with dragons as its totem. Since then, dragons have taken root in the legends of China people. .......