Richard Freeman, an economist at Harvard University, points to several reasons why the traditional theory may need modifying.

哈佛的经济学家richard Freeman指出了传统理论需要修改的几点理由。

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

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%。

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

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%。

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Richard Freeman, zoological director of the organisation, told Guardian Australia he has "no doubt" the species still roams isolated areas of Tasmania.

监护人澳大利亚的组织，动物园主任理查德·弗里曼，告诉他“毫无疑问”的物种仍然漫游塔斯马尼亚岛的偏远地区。

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Richard Freeman, zoological director of the organisation, told Guardian Australia he has "no doubt" the species still roams isolated areas of Tasmania.

监护人澳大利亚的组织，动物园主任理查德·弗里曼，告诉他“毫无疑问”的物种仍然漫游塔斯马尼亚岛的偏远地区。

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