1.traffic congestion 交通拥挤
2.water scarcity 水短缺
3.the environmental pollution 环境污染
4.over-industrialization 过度工业化
5.over-crowdedness 过度拥挤
6.unemployment 失业
7.wealth distribution 财富分配
8.social instability 社会动荡
9.urban construction 城市建设
10.population explosion 人口激增
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