城市变迁实际上,社会城市化是过去150年间才出现的现象。19世纪以前,那些拥有5000及5000以上居民的城市是否一直占有世界人口的3%以上或者某地区人口的15%—20%以上,这是值得商榷的。甚至直到1800年,唯有荷兰和英国两个国家有1/5的人口长期定居在城市和市镇。而欧洲其他国 Urban Changes In fact, social urbanization has been the phenomenon of the past 150 years. Before the 19th century, it was debatable whether cities with more than 5,000 inhabitants and 5000 inhabitants had occupied more than 3% of the world’s population or more than 15% -20% of the population in a certain area. Even until 1800, only one-fifth of the population in the Netherlands and the United Kingdom lived permanently in cities and towns. Other European countries