大海捞针 大海撈針
dà hǎi lāo zhēn
Meaning
lit. to fish a needle from the sea; to find a needle in a haystack (idiom)
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Examples
这好比大海捞针。
zhè hǎo bǐ dà hǎi lāo zhēn。
It is like looking for a needle in a haystack.