rú / guǒ / méi / yǒu / xiàn / suǒ / zài / rén / qún / zhōng / zhǎo / tā / jiù / xiàng / dà / hǎi / lāo / zhēn

如果没有线索，在人群中找他就像大海捞针。

Without any clues, finding him in the crowd would be like finding a needle in a haystack.