大海捞针
5.We often ignore the real problem and instead search for a needle in a haystack .
6.Searching for one man in this big city is like looking for a needle in a haystack.
7.Spotting stocks that are likely to increase in value is a little like looking for a needle in a haystack.
8.There is no use searching for him in this crowd; it is like looking for a needle in a haystack.
9.Somewhere along that waterfront there might be somebody who knew her, but it was like looking for a needle in a bundle of hay.
10.Trying to find a pen that works in this house is like trying to find a needle in a haystack.
