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Not necessarily correct; may not be accurate.
他的理论听起来很有道理，但未必一定对。
His theory sounds reasonable, but it's not necessarily correct.
你的推理过程未必一定对，需要重新审视。
Your reasoning process may not be correct; it needs to be re-examined.
Used to express skepticism about the correctness of a statement or idea.
Use '未必一定对' when you want to express doubt or skepticism without being overly critical. It is softer than directly saying '不对' (incorrect).
This phrase is useful for suggesting that someone's idea or statement might need verification, making it a polite way to question without outright disagreement.
The phrase combines '未必' (wèi bì, 'not necessarily') and '一定对' ('must be correct'), forming a compound expression to express doubt about the accuracy of a statement.
This phrase is commonly used in spoken and written Chinese to politely or cautiously express that something might not be correct, often in academic, professional, or everyday contexts.