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English definition of “not know the first thing about sth”

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not know the first thing about sth

to know nothing about a subject: I'm afraid I don't know the first thing about car engines.
Translations of “not know the first thing about sth”
in Chinese (Traditional) 對…一無所知…
in Chinese (Simplified) 对…一无所知…
(Definition of not know the first thing about sth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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