大 ㄉㄚ ˋ dà 海 ㄏㄞ ˇ hǎi 捞 ㄌㄠ lāo 针 ㄓㄣ zhēn 大 ㄉㄚ ˋ dà 海 ㄏㄞ ˇ hǎi 撈 ㄌㄠ lāo 針 ㄓㄣ zhēn lit. to fish a needle from the sea to find a needle in a haystack (idiom)