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Phrase(s): vary between something and something else
to fluctuate between one thing and another. • The daytime temperatures vary between 80 and 90 degrees. • She varies between angry and happy., Phrase(s): vary between someone and someone else [and] vary between something and something else
to fluctuate in choosing between people or things. • In choosing a bridge partner, Sam varied between Tom and Wally. • I varied between chocolate and vanilla cake for dessert.
McGrawhill's American Idioms And Phrasal Verbs