clues
n.
线索( clue的名词复数 );
提示;
（帮助警方破案的）线索;
（纵横填字谜、游戏或问题的）提示词语;
例句:
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Clues are thin on the ground for this bunch.
来自BBC
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There was a vast distance between psychological clues and concrete proof.
心理提示和确凿证据之间相差甚远。
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He left a trail of clues at the scenes of his crimes.
他在犯罪现场留下了一些蛛丝马迹.
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The police think the videotape may hold some vital clues to the identity of the killer.
警方认为那盘录像带可能录有能确认凶手身份的一些重要线索。
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With no clues, the mystery went cold again.
来自WSJ
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We look to the older Dolly women for clues.
来自NEWYORKER