Through repair was made in city wall and moat historically every 200 years.
历史上城墙与护城河自筑成至今基本上是相隔200余年大修一次。
参考来源 - 西安护城河整治与水体修复研究Based on that, the value of the moat in modern city are described systematically, and at last, deficiencies of the river area during the development process are proposed.
在此基础上,系统阐述了护城河在现代城市中的价值;最后,分析提出河域发展过程中存在的不足之处。
参考来源 - 济南护城河风貌保护与发展·2,447,543篇论文数据，部分数据来源于NoteExpress
N-COUNT A moat is a deep, wide channel dug around a place such as a castle and filled with water, in order to protect the place from attack. 护城河
Lucille's home was very grandly called a chateau, though in truth it was nothing more than a large moated farm.
露西尔的家美其名曰城堡，事实上不过是一座壕沟环绕的大农场。
The moated palaces, with their golden tiled roofs and red pillars, are surrounded by high walls with a tower on each corner.
紫禁城的屋顶覆盖着金色的砖瓦，由红色的柱子所支撑。四周由高墙和深沟所围绕，墙角并设有塔楼。
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