Jǐngfāng àntú-suǒjì, hěnkuài jiù zhǎodào le xiányírén.
The police followed the clues and quickly found the suspect.
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From 汉书, alluding to Bo Le (伯乐), the legendary horse expert: trying to find a prized steed using only his illustrated horse manual. Originally mocking - rigid, unimaginative searching - now often neutral, meaning 'to trace by clues'.