Word: city wall
Phonetic: chéng guō
Definition: ①City wall. Cheng refers to the wall of the inner city, and Guo refers to the wall of the outer city: green tiles and red tiles illuminate the city wall. ②Generally refers to "city" or "city": the city walls and warehouses are empty, and many people are in exile.
In ancient times, it means inner city and outer city, and generally refers to a city or a city.
Tang Du Mu's "Afang Palace Ode": "There are more straight columns and horizontal sills than in the nine soils (city walls)."
Yao Nai (nai) of the Qing Dynasty: "Watch the evening sun ( The city wall), Wenshui and Cuulai are picturesque. "
"New Odes of Yutai·Old Poetry Written by Jiao Zhongqing's Wife": "The host has a virtuous daughter, and the city wall is graceful and graceful."
From From the Spring and Autumn Period to the Ming and Qing Dynasties, except for Qin Shihuang's Xianyang, the capitals of other dynasties had a city wall system. The system of city walls refers to the urban construction system of "building a city to protect the king and building a wall to protect the people" ("Wu Yue Chun Qiu"), "the inner city is the city and the outer wall is the wall". Generally, the capital has three walls: the palace city (Da Nei, Forbidden City), the imperial city or inner city, and the outer city (Guo); the capital city has two walls: Zicheng and Luocheng.
There are two forms of city walls: