城市的快速发展可能引起社会和经济问题，比如污染和交通问题。
The rapid expansion of cities can cause social and economic problems, such as pollution and traffic problems.
来自南京大学的社会学教授周晓红说，这种角色的转变来自社会和科技的快速发展。
The change of roles comes from the rapid development of society and technology, says Zhou Xiaohong, a sociology professor from Nanjing University.
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