"city" means the walls around the city, the inside is called the city, and the outside is called Guo; Country, country; Refers to a densely populated place with developed industry and commerce.

Cheng (Pinyin: chéng) is a Chinese character (commonly used word) with a first-class general specification. The ancient writing of "city" was first seen in the bronze inscriptions of the Western Zhou Dynasty, and "city" was first seen in the Warring States Period. The original meaning of "city" is the wall around the city. The inside is called the city and the outside is called Guo. When the word "city" is used alone, it mostly includes city and Guo. City and Guo only refer to the city when they raise each other. In ancient times, a city also had the meaning of a country and a country. For example, a central city means a central country. In modern times, the Lord refers to a densely populated place with developed industry and commerce, and is usually the political, economic and cultural center of the surrounding areas. Some modern large-scale business places are also called cities, such as cinemas and clothing cities.

The original meaning of a city refers to a city wall, that is, a high wall built in ancient times to defend or divide areas, such as the Great Wall of Wan Li and the city in the alliance under the city. The city is divided into inner and outer cities. The inner city is called the city and the outer city is called Guo. The city wall is usually built along the periphery of the settlement, enclosing the settlement, and the old city also refers to the places within the city wall, such as the urban area, Dongcheng, Xicheng and so on. From this, the city refers to the city, which is relative to the countryside, such as the difference between urban and rural areas, the storm in the city, and the city in the city that never sleeps, and its meaning is relative to the countryside.

China has built various types of cities in history, most of which are fortifications, such as the Great Wall of Wan Li. Although the purpose of building the city wall is mainly for garrison, the main function of the city is to facilitate people's lives. With the development of market economy, the meaning of city is constantly enriched. In modern times, in order to reflect a certain scale or style, people often call some large-scale professional markets, such as shopping malls, food cities and book cities.