研究人员将总人口划分了三个年龄组，分别比较观察了07年四季度至12年四季度，每组“无业人口”与各自人口总数的比例变化。
The researchers focus on movements in "non-employment" as a share of the total population in three age groups between the final quarters of 2007 and 2012.
研究人员将总人口划分了三个年龄组，分别比较观察了07年四季度至12年四季度，每组“无业人口”与各自人口总数的比例变化。
The researchers focus on movements in "non-employment" as a share of the total population in three age groups between the final quarters of 2007 and 2012.
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