犹如在大海里捞针，这也许几分钟就能破解，或者是需要好几天。
Its a needle in a haystack and it can take a minute for the crack to be completed or maybe days.
小偷跑得很快，消失在地铁的人山人海里。警察要找他好像大海捞针一样。
The thief ran quickly and disappeared in a sea of faces in the subway, leaving the policeman with a job like finding a needle in a haystack.
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