underclasses
[ʌndərk'lɑ:sɪz]
n.
下层社会，下层阶级( underclass的名词复数 );
例句:
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It also toughens the kids up you see, and prepares them for a priviledged life where emotion is the preserve of the underclasses.
来自BBC
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It also smacks of the underclasses getting their revenge on the wealthier people in the country.
来自BBC