复数：upper classes
n.the class occupying the highest position in the social hierarchy
同义词：upper crust
adj.occupying the highest socioeconomic position in a society
同义词：upper-class
Upper Class
Women of the Upper Class
Philadelphia gentlemen : the making of a national upper class
Bobos in Paradise: The Upper Class and How They Got There
Book Review: Our Kind of People: Inside America's Black Upper Class
Our Kind of People: Inside America's Black Upper Class
Mother-Daughter Communication about Sex and Sexual Intercourse among Middle- to Upper-Class African American Girls.
The Role of Shared Reading in the Development of Phonological Awareness: A Longitudinal Study of Middle to Upper Class Children
Review of Our Kind of People: Inside America'S Black Upper Class
The Rise of American Boarding Schools and the Development of a National Upper Class
