The researchers looked at data from the Panel Study of Income Dynamics, which has been conducting a survey of American families since 1968.
调查者查看了收入动态专门研究小组自从1968年就对美国家庭实施的一项调查。
The researchers looked at data from the Panel Study of Income Dynamics, which has been conducting a survey of American families since 1968.
调查者查看了收入动态专门研究小组自从1968年就对美国家庭实施的一项调查。
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