N-COUNT [usually singular]下层社会;社会底层 A country's underclass consists of those members of its population who are poor, and who have little chance of improving their situation. 下层社会;社会底层
The basic problems of the inner-city underclass are inadequate housing and lack of jobs.
老城区底层人群面临的基本问题是住房紧张和就业不足。
Welfare has become identified with the long-term poor, the underclass.