a needle in a haystack Definition in the Cambridge English Dictionary
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Definition of “a needle in a haystack” - English Dictionary

Definition of "a needle in a haystack" - British English Dictionary

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a needle in a haystack

something that is ​impossible or ​extremelydifficult to ​find, ​especially because the ​area you have to ​search is too ​large: Finding the ​piece of ​paper I need in this ​hugepile of ​documents is like looking for/​trying to ​find a needle in a ​haystack
(Definition of a needle in a haystack from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
Translations of “a needle in a haystack”
in Chinese (Simplified) 不可能(或极难)找到的东西, 大海里的针…
in Chinese (Traditional) 不可能(或極難)找到的東西, 大海裡的針…
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