Moreover, today, more than half of the world&#39s population除此以外，超过世界人口的一半以上live in cities.都居住生活在城市。In the developed world, it&#39s about 78 percent.在发达国家中，这种比例达到了78%。More than three out of four people超过了四分之三的人口live in urban institutions, urban places,居住在城市的机构、场所，in cities today.城市的各个地方。So cities ar