clues
A clue to a problem or mystery is something that helps you to find the answer to it.
Geneticists in Canada have discovered a clue to the puzzle of why our cells get old and die.
加拿大的遗传学家已经发现了解开我们细胞衰老死亡之迷的线索。
A clue is an object or piece of information that helps someone solve a crime.
The vital clue to the killer's identity was his nickname, Peanuts.
关于杀手身份的重大线索是他的绰号——花生。
A clue in a crossword or game is information which is given to help you to find the answer to a question.
Give me a clue. What's it begin with?
给我点提示。它是以什么开头的?
haven't a clue
If you haven't a clue about something, you do not know anything about it or you have no idea what to do about it.
I haven't a clue what I'll give Carl for his birthday next year.
对于明年该送什么生日礼物给卡尔我毫无头绪。