城市，作为社会生活的集汇点，既表现为社会生活的共同性，又表现为社会文化背景的个体特殊性和复合性。所以才有了天津与广州的不同，北京与上海的不同，伦敦与纽约的不同。建筑，作为人类时刻与之相容共处的物质空间，有它不可分割的两面性，一是建筑的外剖形态，构成着城市 As a gathering point of social life, cities, not only show the commonality of social life, but also show the individual particularity and compoundality of the social and cultural backgrounds. So there is a difference between Tianjin and Guangzhou, Beijing and Shanghai, the difference between London and New York. Building, as the physical space with which human beings live in compatible time and place, has its indivisible duality. The first is the external profile of the building, which constitutes the city