invariant nouns
(colloquial, derogatory) A private security guard, usually one regarded as inferior to and less skilled than a true law enforcement officer.
plural of invariant noun
(informal) A class, at a college or university, in which psychology is taught.
(psychiatry) A hallucinatory, dream-like state caused by sleep deprivation, drugs, etc.
英語を学ぶと、いくつかの不変名詞は単数形と複数形で同じ形を保つことに気づくでしょう。
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