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Not necessarily; possibly not; maybe not
他不一定会来。
He may not come.
这个结果不一定准确。
This result may not be accurate.
Used to express uncertainty or possibility that something may not happen or be true.
Use '不一定' to express uncertainty or possibility that something may not happen or be true.
Combination of 不 (not) and 一定 (certainly), forming a phrase to express uncertainty.
Often used to soften statements or express that something is not guaranteed.