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Từ điển Oxford Learners Wordfinder Dictionary
unknown quantity
1. a factor in a given situation whose bearing and importance is not apparent (Freq. 1) - I don't know what the new man will do; he's still an unknown quantity • Hypernyms: factor 2. a variable whose values are solutions of an equation • Syn: unknown • Derivationally related forms: unknown (for: unknown) • Hypernyms: variable
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