trace/clue/sign.导航词义：迹象

1. trace:n. 痕迹，踪迹.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。

2. clue:n. 线索.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。

3. sign:n. 征兆，迹象.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。

全部

1·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。《柯林斯英汉双解大词典》

2·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。《柯林斯英汉双解大词典》

3·The only clue he has is a fossil.

他唯一的线索就是一块化石。

4·He did provide one clue.

他确实提供了一条线索。

5·He happened on a clue to the mystery.

他偶然发现了那秘密的线索。

6·Herpin offered the only clue to his condition.

海尔宾提供了关于他的状况的唯一线索。

7·Fortunately, the clue is in the language itself.

幸运的是，线索就在语言本身。

8·The words themselves offer the clue as to when best to use them.

这些词本身就为我们提供了何时可以恰当使用它们的线索。

9·The police followed home the clue and finally caught the culprit.

警察根据线索追根到底，终于抓住了这个罪犯。《新英汉大辞典》

10·She spent hours poring over the text, searching for a clue that might help solve the case.

她花了几个小时仔细研读课文，以寻找可能有助于破案的线索。

线索

1·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。《柯林斯英汉双解大词典》

2·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。《柯林斯英汉双解大词典》

3·The only clue he has is a fossil.

他唯一的线索就是一块化石。

4·He happened on a clue to the mystery.

他偶然发现了那秘密的线索。

5·Herpin offered the only clue to his condition.

海尔宾提供了关于他的状况的唯一线索。

头绪

1·I moved out to California without any clue about what I might do after graduation.

我搬到了加利福尼亚，对毕业后我会做什么毫无头绪。

2·The caveman wondered out, looked up and saw those dots of lights, and he has no clue.

穴居人走到了野外，抬头看天，看到星星点点的光，茫然一片，毫无头绪。

3·When I got home, I didn't have a clue what to make that evening, never mind what to cook in 5 or 6 days time.

当我回到家，我对于当晚要做什么食物毫无头绪，更不要说在未来的5,6天里会做什么吃了。

4·We've also shown how you could get started with making money online if you are new to web working, want to make a living from the Internet, and have no clue.

如果你是位想从互联网赚钱谋生的网络工作新手，但毫无头绪，那么我们同样也教你如何开始网络赚钱。

5·I haven't a clue.

我一点头绪都没有。

端倪

1·If bad luck, touch not equal to idea, that also don't try so hard, to let others see clue.

要是运气不好，摸到的牌不如意，那也不要着急，让别人看出端倪。

2·Although the new economy also only appears in American one, but other various countries also all appeared the new economical clue including our country.

虽然新经济还只在美国一家出现，但是其它各国包括我国也都出现了新经济的端倪。

3·The toy and gift industry experience severe winter is not an coincidence but showed the dew clue several years ago.

玩具礼品行业经历严冬并非今日之事，早在几年前已经初露端倪。

(1)clue in向...提供情况

(1)get a clue得到线索；理解；领会

(1)clue on提示

(1)not have a clue什么也不知道；毫无头绪