Finding a needle in a haystack is impossible.

在干草堆里找到一根针是不可能的。

It is a needle in a haystack.

就是大海捞针。

To look for a needle in a haystack.

草垛里找针（大海捞针）。

Like looking for a needle in a haystack

如同在稻草堆里找一根针（大海捞针）

It was like looking for a needle in a haystack.

如同海底劳针.

It's like looking for a needle in a haystack.

这就好像大海捞针那么难。

Trying to find this file is like a needle in a haystack!

想找这个档案就像大海捞针一样困难.

Finding a needle in a haystack: Virtually impossible to find. Trying to get a new job these days is like trying to find a needle in a haystack.

大海捞针：几乎找不到。这些天想找一份新工作就像大海捞针。

And finding an address can be like looking for a needle in a haystack.

而寻找一个地址也可能象是大海捞针一样。

It is impossible for them to find the banknote. It a needle in a haystack.

他们不可能找到那张支票, 那简直等于大海捞针.