大海撈針

dàhǎilāozhēn

fish for a needle in the ocean; look for a needle in a haystack

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da4 hai3 lao1 zhen1

lit. to fish a needle from the sea, to find a needle in a haystack (idiom)

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大海撈針|大海捞针 [dà hǎi lāo zhēn] ► lit. to fish a needle from the sea ► to find a needle in a haystack (idiom)