find a needle in a haystack
大海捞针
(dàhǎi lāo zhēn )
A: Could you help me find a file?
你能帮我找一份文件吗?
(nǐ nénɡ bānɡ wǒ zhǎo yīfèn wénjiàn ma? )
B: You mean the case that happened 28 years ago?
你说的是28年前的那份案件吗?
(nǐ shuō de shì èrshíba nián qián de nàfèn ànjiàn ma? )
A: Yeah.
是啊。
(shì a .)
B: But it would be a like finding a needle in a haystack!
可这就像海底捞针一样, 很难啊!
(kě zhè jiù xiànɡ hǎidǐ lāo zhēn yīyànɡ, hěnnán a.)