Until recently, no one had tried to control for unobserved characteristics in measuring the effect of an elite education on earnings.
直到最近才有人试图核实这些被忽视的因素在衡量精英式教育对收入情况产生的影响。
Until recently, no one had tried to control for unobserved characteristics in measuring the effect of an elite education on earnings.
直到最近才有人试图核实这些被忽视的因素在衡量精英式教育对收入情况产生的影响。
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