People walk through the city, not only the walk of space, but also the passage of time. The integrity of time series is the context and genealogy of a city, and it is the blood and temperament of a city. Money and technology can make a city tall quickly, but not a city long. The value of a modern handicraft made of a lot of gold, silver and jewelry may not be comparable to that of a simple or even damaged Song Dynasty porcelain vase, and the value between them lies only in time.
The integrity of time series is referred to as 'it' in this paragraph.