短语词组短語Lower Second Class 二等二級;二等二Lower social class 工人堦級lower -class 平民堦層the lower -class 下層民衆lower r class limit 組下限lower middle class 中産堦級;中下堦級;中産堦級的下層;堦層lower working class 下層工人堦級lower age class 低齡級 返回 lower class