underprivileged class

基本解释

The underprivileged child from the crowded slum tenement has many more problems to overcome than the child from the middle-class home.
来自拥挤的贫民窟中的穷孩子，比中产阶级的孩子有更多的问题要克服。
blog.sina.com.cn
The NYU Shanghai campus will be a world-class university. It will offer scholarships to excellent students, with preference given to those from underprivileged families, Yu said.
上海纽约大学将成为世界一流大学，优良生可享受奖学金，对家庭麻烦的优先思索。
The belief in witchcraft is predominant amongst the underprivileged rural class, and it holds that child-witches bring destruction, waste, hardship, disease and death to their families.
在底层农村阶级中，巫术的信仰占着主导地位，这种信仰相信中了巫术的孩子会给他们的家庭带来毁灭、浪费、困苦、疾病和死亡。

Proposed in January in a White Paper on higher education, the idea aroused a mixture of despair (from universities that think they already do everything possible to attract the miserably small number of qualified but underprivileged applicants available) and fury (from middle-class parents, who felt thrift and diligence were being penalised).
ECONOMIST: Social engineering