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纯粹主义者；正统主义者
A purist is a person who wants something to be totally correct or unchanged, especially something they know a lot about.
例句
The new edition of the dictionary carries 7000 additions to the language, which purists say is under threat.
该词典的新版为该语言新增了7,000个词条，纯粹主义者们称该语言正面临威胁。