Trends in arithmetical average incomes and median household incomes have differed in the us for a variety of reasons.
在美国，数学计算的平均收入趋势和家庭收入中位数的趋势截然不同，原因是多种多样的。
Trends in arithmetical average incomes and median household incomes have differed in the us for a variety of reasons.
在美国，数学计算的平均收入趋势和家庭收入中位数的趋势截然不同，原因是多种多样的。
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