clue
单词辨析：
指某人、某物曾经出现或存在过的迹象。
The police found some traces of the robbers.
警方已经找到强盗的一些踪迹。
The killer disappeared without a trace.
杀手消失得无影无踪。
There was no trace of any drugs in his blood.
他的血液中未有毒品存在的任何迹象。
指帮助弄清事情缘由或帮助破案、解开谜团的线索。
At last she found a clue to the puzzle.
最后她找到了解开那个谜的头绪。
Are there any clues we can use to find the murderer?
有我们能用来找到凶手的线索吗？
We have no clue as to where she went after she left home.
我们对她离家后去往何处毫无线索。
指某事属实、即将发生或存在着的迹象。
Dark clouds are the sign of heavy rain.
乌云是大雨将至的预兆。
At the first sign of danger, the submarine will submerge.
一有危险迹象，潜艇就会潜入水中。
There was no sign of a roadblock.
那儿没有设置路障的迹象。
相关例句：
You found an actual clue!
你发现了一条真正的线索！
But I don't have a clue as to what that means about the skeletal system?
但问题是，我想不明白这怎么就和骨骼系统扯上了关系。
My clue is kind of pointing this way.
我的线索指向了这边。
What clue are we missing?
我们遗漏了什么线索？
The vital clue to the killer's identity was his nickname, Peanuts.
查明杀手身份的重要线索是他的外号叫“花生”。
If you get stuck you can ask for a clue, or ask on twitter.
如果卡住了，你可以要求给予提示或到twitter上发问。