clue

The detective found a muddy footprint, which was a vital clue in the investigation.

(Chinese) 侦探发现了一个泥泞的脚印，这是调查中的一个关键线索。

The crossword puzzle provides a short clue for every word you need to find.

(Chinese) 填字游戏为每一个你需要找的单词提供了一个简短的提示。