Explain the verse (bonus points)

He came from South Xuzhou to Wenchang Hall to report his political achievements.

Liu Yuxi's "Sending Li Shangshu to Town Huazhou": Nanxu reported to Wenchang, and Dongjun needed to build a separate chapter. The name of the grass is high, and it is the same as the Shu guest, and Yongya is better than Xunlang at a young age. A meander of the Yellow River flows beneath the city, and thousands of Tiqi rides illuminate the roadside. Since ancient times, prime ministers have been giving out prime ministers, and now people look at them on the rock corridor.

Nanxu: ancient state name. Overseas Chinese from the Eastern Jin Dynasty established Xuzhou in Jingkou City, and it was renamed Nanxu during the Southern Song Dynasty, which is now Zhenjiang City, Jiangsu Province. It lasted through Qi, Liang and Chen, and was abolished during the reign of Emperor Kaihuang in Sui Dynasty. "Book of the Song Dynasty, Prefecture and County Chronicles 1": "In the second year of Emperor Wu's reign, Xuzhou was added and called Nanxu, while Huaibei was named Xu. In the eighth year of Yuanjia, Emperor Wen's reign, the north of the Yangtze River was called South Yanzhou, and the south of the Yangtze River was called South Xuzhou, and Jingkou was governed. "Nanxu is the name given by the Song Dynasty to today's Zhenjiang during the ancient Southern Dynasties.

Report on politics: report on political achievements. "Historical Records: The Family of Duke Zhou of Lu": "After the death of Duke Zhou, Zi Boqin had already been granted the title of Duke of Lu. At the beginning, Duke Boqin of Lu was granted the title of Duke of Lu, and after three years he served Duke Zhou of government. Duke Zhou said: 'Why is it too late? Or? ' Bo Qin said: 'Change the customs, change the rituals, and then eliminate them after three years of mourning. '" Later, it became a classic for the local officials' outstanding political achievements. Tang Dynasty Liu Yuxi's "The Minister of Military Affairs Gongqi at the Gate": "In memory of the merits of serving the government on the outer stage, I pursue the affairs of the front table of the palace."

Wenchang: the name of the palace. "Selected Works·Zuo Si's "Wei Du Fu"" says: "Building Wenchang's broad hall is the most magnificent building." Zhang Zai's note: "Wenchang is also the name of the main hall." Liang Shenyue of the Southern Dynasties "Eight Ode Poems·Jie Pei Qu" "Chao Shi": "Speaking of Jinhua comes to the propaganda room, and the military tent in the day comes to Wenchang in the evening." King Luo Bin of the Tang Dynasty "Cong Past Chapter": "The sword comes out of the military tent, and the pen enters Wenchang.