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English definition of “be one/another of life's great mysteries”

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be one/another of life's great mysteries

to be something that is very difficult to understand: It really is one of life's greatest mysteries why that awful restaurant is busy every night.
Translations of “be one/another of life's great mysteries”
in Chinese (Traditional) 令人不解,使人困惑…
in Chinese (Simplified) 令人不解,使人困惑…
(Definition of be one/another of life's great mysteries from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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