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此篇無難的單字 但卻是作文的好材
cities have always been at the center of economic growth anf technological advances. the promise of jobs and prosperity pulls people to cities. but their rapidly growth has also brought with it many nagative things: violence, proverty, overcrowding, health problems and pollution. many cities in developing countries in particular are growing too rapidly for thier own good, with many residnets unable to find jobs and forced to live in slums. poor air and water quality, insufficient water avalibility, waste-disposal problems, and high energy comsumption are exacerbated by the increasing population density and demands of urban enviroments. strong city planning will be essential in managing these and other difficulties as the world's urban areas swell.