sociology
n.社会学
Sociology is the study of human social behavior, especially the study of the origins, organization, institutions, and development of human soceity.
社会学研究的是人类的社会行为，尤其是对人类社会的起源、组织、制度和发展进行研究。
hierarchy
n.层次；等级体系
The government is a hierarchy.
政府是个官阶分明的统治集团。
sociologist
n.社会学家
marriage
n.结婚，婚姻(matrimony)
My sister's marriage took place at ten o'clock today.
我姐姐的婚礼在今天上午十点举行。
phenomenon
n.现象
urban
adj.城市的，市内的(metropolitan)
rural
adj.乡下的，田园的(rustic)
Crops are grown in rural areas.
农村地区生长农作物。
urbanization
n.都市化
Urbanizaiion has taken place very rapidly in developing countries.
发展中国家的城市化进程非常迅速。
migration
n.移民(immigration);移植；移往；移动
Scientists have studied the migration of fish over long distances in the river.
科学家们研究了鱼在河里的长距离迁移活动。
immigration
n.移居入境
emigration
n.移民出境，侨居
mobility
n.流动
There's been restructuring of industry and downward mobility for Americans as a whole.
美国整体调整产业结构，降低流动性。
community
n.社区；社会；公社
Government, business and community are the three pillars of our society.
政府、商界和社区是社会的三个支柱。