康奈尔大学劳动经济学家夏农·柏克特表示他们曾经能够确保中产阶级收入。

Cornell University Labor Economist Sharon Poczter said they were once a ticket to a secure middle class salary.

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哈佛大学的劳动经济学家，理查德弗里曼说，到2006年，美国只招收了全球大学生的12%。

Richard Freeman, a labour economist at Harvard University, says that by 2006 America was enrolling just 12% of the world’s students.

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哈佛大学的劳动经济学家，理查德·弗里曼说，到2006年，美国只招收了全球大学生的12%。

Richard Freeman, a Labour economist at Harvard University, says that by 2006 America was enrolling just 12% of the world's students.

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