If by 'suburb' is meant an urban margin that grows more rapidly than its already developed interior, the process of suburbanization began during the emergence of the industrial city in the second quarter of the nineteenth century.
若将'郊区'定义为比已开发城区增长更快的城市边缘，则郊区化进程始于19世纪第二季度工业城市出现时。
If by 'suburb' is meant an urban margin that grows more rapidly than its already developed interior, the process of suburbanization began during the emergence of the industrial city in the second quarter of the nineteenth century.