dà​hǎi​lāo​zhēn

needle in a haystack

Senses

大海捞针/ 大海撈針 dà​hǎi​lāo​zhēn needle in a haystack

idiom · To fish for a needle in the sea; to engage in a search that is virtually impossible or extremely difficult to succeed.

在这座大城市里找一个多年未见的朋友,简直是大海捞针。

References

see 海底捞针/海底撈針 大海捞针/大海撈針