To look for something in the wrong place; to seek something where it does not exist or cannot be found; to make a futile search.
如果你想找到最新的畅销书，却跑去一家古董店里找，那简直是求马唐肆。
If you want to find the latest bestsellers but go to an antique shop to look for them, that's simply seeking a horse in an empty market stall.
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