General terms relating to the study of society.
行业： 社会学
Obstacles encountered by the poor that prevent their upward social mobility.
家庭是只有一个父目前照顾孩子。
长期贫困的人口缺乏培训和技能的人。
不必工作兼职当全职工作的一个条件是渴望和追求。
通过由政府单位维护登记系统收集的出生、 死亡、 婚姻和离婚的记录。
A theory of social change that holds that all societies pass through the same successive stages of evolution and inevitably reach the same end.
A measurable trait or characteristic that is subject to change under different conditions.
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