Age structure: proportion of each age group among gross population.
流动人口在总人口中占了很大比例占很大比例Floating population accounts for a great proportion of the total population.
what is the percentage of chinese population to world population?
年龄结构：各年龄组在人口总数中的比重 age composition: the proportion of different age groups in the population as a whole / age composition: the proportion of different age groups in the total / entire population
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