a needle in a haystack
大海捞针
口语·形容极难找到的事物
英文释义
something that is very difficult or impossible to find or locate
例句
Finding my lost earring in this park is like looking for a needle in a haystack.
典故来源
源自16世纪英国农业社会，干草堆中找针极为困难，后广泛用于形容极难寻找的事物。