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二十年前,有位美国社会学的大学教授,曾叫自己的学生到巴尔的摩的贫民窟,调查二百名男孩的成长背景和生活环境,并对他们的未来发展做一个评估,每一位学生的结
Twenty years ago, a professor of university professions in American sociology who had called his students to Baltimore's slums, investigated the growth background and living environment of 200 boys and made an assessment of their future development. Every student The knot