debutante
noun [ C ] uk/ˈdeb.juː.tɒnt/ us/ˈdeb.juː.tɑːnt/ (also deb)
（尤指旧时英国）初进社交界的上流社会年轻女子
a rich young woman who, especially in the past in Britain, went to a number of social events as a way of being introduced to other young people of high social rank
a debutantes' ball 初次露面社交舞会