大禹治水成功后，人们都过上了安居乐业的生活。 After Dayu controlled the flood successfully, people lived and worked in peace and happiness.
有一天，大禹在洛河边救了一只大乌龟。 One day, Dayu saved a big tortoise by the Luo River.
乌龟为了感谢大禹，送给他一块来自洛河河底的玉石。 In order to appreciate Dayu, the tortoise gave him a jade from the bottom of the Luo River.
这块玉石上的内容叫洛书。洛书上有一些符号，这些符号帮助大禹治理国家，最终他成为了皇帝。 The content on this jade is called Luoshu. There are some symbols in Luoshu. These symbols helped Dayu govern the country, and finally he became the emperor.