wage earning class 工资劳动阶级
Growing income inequality has coincided with the increasing importance of a college degree for earning a middle-class wage.
收入不平等加剧的同时，大学学位对获得中产阶级收入的重要性也在不断提高。
Meanwhile, growing income inequality has coincided with the increasing importance of a college degree for earning a middle-class wage.
与此同时，收入不平等加剧之际，要想赚到中产阶级的收入，大学学历的重要性越来越大了。
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