在收入方程中引入社会背景变量后，明显地降低了个人教育收益率的估计值。
The results showed when social background variables is added into the earning, education return becomes obviously lower.
在收入方程中引入社会背景变量后，明显地降低了个人教育收益率的估计值。
The results showed when social background variables is added into the earning, education return becomes obviously lower.
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