东海捞针 is an idiom

东海捞针dōng hǎi lāo zhēn

从大海底下捞取一根针，形容非常难达到目的。

Origin 元·柯丹丘《荆钗记·误讣》：“儿，此生休想同衾枕，要相逢除非东海捞针。”

Word breakdown for “东海捞针”: Open in Reader →

1.East China Sea2.East Sea (Chinese mythology and ancient geography)

see 东海县[dōng hǎi xiàn]

捞撈HSK 7–9

1.to fish up2.to dredge up

针針HSK 4

1.needle2.pin3.injection4.stitch+1 more

针鍼HSK 4

variant of 针[zhēn], needle