HSK 6
线索
xiànsuǒ名
trail; clues; thread (of a story)
警察从录像中发现重要线索。
Jǐng chá cóng lù xiàng zhōng fā xiàn zhòng yào xiàn suǒ.
Police found an important clue in the video.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 6.