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The results indicate that heterogeneity of race and heterogeneity of family educational background can increase the achievement of children from weak educational backgrounds with no adverse effect on children from strong educational backgrounds.
结果表明，种族异质性和家庭教育背景异质性可以提高弱教育背景儿童的学习成绩，而对强教育背景儿童没有不良影响。