栏目特邀主持人:吴恩培主持人语:中国古代城市各类建筑的社会功能中,城墙及城墙外侧的护城河是城市防御最主要的军事设施和公共安全屏障。它们是不可分割的整体,共同构成一座城市历史的实物见证,故在中国古籍方志中,城墙与城墙外侧的护城河习称为“城池”。古城的“城池”不仅在古城中占有重要地位,而且与古城有着极密切的关系。它表现在以下两个方面: Column Invited Host: Wu Enpei Moderator: In the ancient Chinese city buildings of various social functions, the city walls and outside the moat is the city’s most important military defense facilities and public safety barrier. They are inseparable whole, together constitute a physical witness of the history of the city, so in ancient Chinese books, the city wall and the moat outside the city wall called “city”. The ancient city of “city” not only occupies an important position in the ancient city, but also with the ancient city has a very close relationship. It is manifested in the following two aspects: