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English definition of “who can say?”

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who can say?

no one knows: "Is it possible?" "Who can say?"
Translations of “who can say?”
in Chinese (Traditional) 誰能說得準?誰會知道?…
in Chinese (Simplified) 谁能说得准?…
(Definition of who can say? from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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