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ЧитатьTHEORY noun
uk/ˈθɪəri/ us theory noun(PRINCIPLES)
the set of principles on which a subject is based
теория
economic theory in theory
B2 If something is possible in theory , it should be possible but often it does not happen this way.
теоретически
In theory , the journey should be shorter but in practice, the roadworks slow you down.