词汇：
housing problem住房问题
pay attention to social morality讲究社会公德
child abuse虐待待童
cause alarm and attention引起警惕和关注
aging of population人口龄化
rush into the city冲进城市
to pay by installments分期付款
unemployment失业
pose a threat to构成威胁
traffic light交通灯
student union学生会
undergraduate本科生
postgraduate研究生
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