His findings, which use tax data to track graduates over time, cover the years before the U. s. plunged into a recession that damped job prospects in many U. s. industries and universities.

他的研究结果使用了税收数据来跟踪毕业生，反映的是美国陷入衰退，多个行业与大学就业前景受损之前的情况。

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His findings, which use tax data to track graduates over time, cover the years before the U. s. plunged into a recession that damped job prospects in many U. s. industries and universities.

他的研究结果使用了税收数据来跟踪毕业生，反映的是美国陷入衰退，多个行业与大学就业前景受损之前的情况。

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