look for a needle in a haystack

大海捞针;无谓的寻找

To find her in such a big city is like looking for a needle in a haystack
在这么大的城市里找她就像大海捞针

look  for   a   needle  in  a   haystack.
To  find  her  in  such  a   big  city  is  like  looking  for  a  needle  in a  haystack.

To seek my future wife is like looking for a needle in a haystack.[s:18]

look for a needle in a haystack大海捞针；无目标的寻找

To find her in such a big city is like looking for a needle in a haystack
在这样大的城市要找到她真的是大海捞针。

Look for a needle in a haystack.
Nothing in the world  is difficult for one who sets his mind to it (世上无难事只怕有心人)

look for a needle in a haystack ,

To find her in such a big city is like looking for a needle in a haystack
在这么大的城市里找她就像大海捞针

Nothing in the world  is difficult for one who sets his mind to it (世上无难事只怕有心人)