它最初是在唐代为了保护城市而建造的，现在已经完全修复了。
It was built originally to protect the city in the Tang dynasty and has now been completely restored.
人们必须关心他们的城市，以保护城市遗产。
People have to care about their city in order to preserve its heritage.
保护城市的历史和文化环境可以提高居民的生活质量。
Conservation of a city's historic and cultural environment enhances the quality of life for residents.
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