1. Yao, though clever, failed to accomplish the great cause by himself. After he got Dayu, the world was at peace. Besides, if you want to carry forward the fine tradition of saints, you can only choose leaders!

And: indicates a progressive relationship, which is equivalent to "return" and "division".

2. From: Sima Qian's Historical Records Biography of Xiongnu, the last paragraph.

3. Part of the original text:

Tai Shigong said: Confucius wrote the Spring and Autumn Annals, which is a chapter between seclusion and Huan, but when it comes to peace and mourning, it is slight. It is useless for him to praise contemporary articles and taboos. Huns who speak secular words have the right to pay attention to it for a while, but they flatter their words, taking one as the whole and not participating in it; I will lead a large number of seats in China, and I am very excited. People mainly make decisions and have not made great achievements. Although Yao is virtuous, he can't succeed in his career and will win in Kyushu. And if you want to promote the holy system, you can only choose a leader! Only the best will be chosen!

4. Historical Records Biography of Xiongnu is a biography of Sima Qian describing the relationship between Xiongnu and China. The full text is divided into four sections: the first section describes the historical evolution of Xiongnu and its historical relationship with China, as well as their national customs and social organization forms; The second paragraph describes the kinship and capricious performance between Xiongnu and Han Dynasty in the early Han Dynasty. The third paragraph is the center of this article, describing the long-term tense relationship between the Han Dynasty and the Xiongnu in the era of Emperor Wudi. The fourth paragraph describes Tai Shigong's views on the war between Emperor Wu and Xiongnu.