What's the use of two allusions to send Zhang Sicheng to meet Fushun Jianlian?

Fushun is in the south of Sichuan, near Yunnan. In ancient times, Yunnan, Guizhou and the vast areas in southwest Sichuan were called "Southwest Yi" in Historical Records and Hanshu. The History of the Three Kingdoms and Huayang History are collectively called "Southland". Successive dynasties have long noticed the development of this area. During the Qin Dynasty, Li Bing and the Great Wall successively built a highway from Sichuan to Yunnan, which was about 2,000 miles long and about five feet wide. Historically, it was called "Wuchidao" (see Historical Records, Biography of Southwest China and Huayang National Records), and officials were also set up in the southwest. The Han Dynasty inherited the Qin system, and continued to send Tang Meng and others to Jianning (now Qujing, Yunnan) to "carve stones and open pavilions" and build official roads; When Emperor Wu of the Han Dynasty arrived in Yunnan, the king of Yunnan surrendered to the Han Dynasty. Emperor Wu of the Han Dynasty still named him the "viceroy" and gave him the title of "king of Yunnan", and successively set up Yizhou, Zhang Yue, Xiang Si, Qianwei and other counties. Since then, the southwest region has a unified national administrative system; The Han dynasty also carried out resettlement, and advanced farming techniques gradually spread from the mainland to the frontier. The first couplet summarizes these historical facts with concise pen and ink.

In the south of China, the ancients regarded it as a wild land. In fact, it is rich in products and simple in folk customs. Jin Shu, Tonghua cloth and bamboo sticks have been exported to foreign countries as early as the Western Han Dynasty, and there are many flavor diets, among which sauce is one. Jelly sauce, a kind of "citric acid sauce". One is a kind of sauce made of Zanthoxylum, which tastes spicy (Historical Records, Biography of Suoyin in Southwest China); The other is chicken brown sauce, which is homophonic with chicken and misunderstood by mainlanders (chicken brown oil in Yi Yin). Chicken's paw is an aromatic fungus and has always been regarded as "delicious". Ming metabolism "Dian lue Chan" said: "Chicken brown, ... local people preserve it with salt and boil the liquid as oil instead of soy sauce." Nanzhongxiang sauce was sold to the surrounding areas in the Han Dynasty. The folk songs and dances in South China and Central China are rich and beautiful, and Zhuzhici, which spread between Ba and Chongqing, is one of the representatives. It is full of euphemistic thoughts and bright colors, dancing with drums and flutes at the same time. In the Tang Dynasty, Liu Yuxi took it as a new word and became popular. The sentence "Pan Huan" selects these two representative things, which shows the beauty of the scenery in the south of China.