During the reign of Emperor Wu of the Han Dynasty, he did a lot of pioneering things:

First, in the northwest, he sent Zhang Qian to the western regions, which was the first time in Chinese history to visit foreign countries, communicated with the small countries in the western regions at that time, and established the embryonic form of the "Silk Road", which also laid the foundation for the small countries in the western regions to become vassal countries in China;

Second, attack the Xiongnu in the north, pushing the northern border of the Han Dynasty from the northern part of the Great Wall to the vicinity of Mongolia today, completely defeating the Xiongnu, which has been powerful for a hundred years, in exchange for long-term northern stability for future generations;

third, southeast, the then Nanyue country (now Zhejiang and Fujian) was incorporated into the territory.

The Hanwu period in ............ was the first time in the history of our country to expand its territory on a large scale through diplomacy and force. Therefore, the three-character classic describes his greatest achievements here with the most incisive words.