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population structure
agric.	群体结构
demogr.	人口结构
desert.	种群结构
econ.	人口构成
tech.	人口组成
population structure The organization of, and inter-relationships among, inhabitants of a given region, country or city
environ.	人口结构 (区域、居民、国家或城市及其之间的相互关系。)

population structure: 15 phrases in 4 subjects

Agriculture	4
Animal husbandry	1
Economy	3
Technology	7