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如今,整个世界的城市人口急速膨胀,据专家预计,到2030年世界城市人口将从今天的33亿上升到50亿。越来越多的百万人大都市,城市基础结构往往
Nowadays, the urban population of the entire world is rapidly expanding. According to experts, the world’s urban population will increase from 3.3 billion today to 5 billion by 2030. There are more and more millions of people in metropolises, and the urban infrastructure is often