n.下層社會；下層階級；貧困階層

They are the underclass and thus usually left out of the picture. 他們屬于最下層，一般就都被人們所忽略了。

Some blame Britain's unequal society and the large underclass that it creates. 有人將這一結(jié)果歸罪于英國社會的不平等和由此造成的大量下層階級人口。

The long-term unemployed are becoming a new underclass. 長期失業(yè)的人正形成新的貧困階層。