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二次大战后,科技革命解放了大批农村劳动力,同时也使许多国家的无地、少地农民更加贫困,加上服务性行业的发展,出现了农村人口向城市迁移的浪潮。近几年,由于人口流动造成的一系列城市问题,引起了许多国家的重视。从世界范围看,人口从农村流入城市是个总趋势。据联合国最近的一份研究报告估计,本世纪末,世从1950年到目前为止,发展中国家的城市人口已从占其总人口的17％增长到30％;预计到本世纪末将
After the Second World War, the scientific and technological revolution liberated a large number of rural laborers. At the same time, it also made the landless and landless peasants in many countries more impoverished. Coupled with the development of the service industries, there was a wave of rural population migration to the cities. In recent years, a series of urban problems caused by population movements have drawn the attention of many countries. From a global perspective, it is a general trend that the population flows from rural areas into the cities. According to a recent United Nations study, the urban population of developing countries has grown from 17% of its population to 30% by the end of this century so far in 1950; it is estimated that by the end of this century,