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·Headaches may be a sign of stress.

头痛可能是紧张的迹象。《牛津词典》

2·The snow showed no sign of melting.

雪没有一点融化的迹象。《牛津词典》

3·They forced him to sign a confession.

他们强迫他签了供状。《柯林斯英汉双解大词典》

4·They gave Lavalle the thumbs-up sign.

他们给拉瓦列做了一个竖起大拇指的手势。《柯林斯英汉双解大词典》

5·All visitors must sign in on arrival.

来客均须签到。《牛津词典》

6·It's a sure sign of economic recovery.

这是经济复苏的确切迹象。《牛津词典》

7·I had no choice but to sign the contract.

我别无选择，只好签了合同。《牛津词典》

8·Here are some letters I want you to sign.

给，我这有些信需要你签字。《柯林斯英汉双解大词典》

9·The gloomy weather shows no sign of improving.

阴沉的天气没有丝毫转晴的迹象。《牛津词典》

10·Check the terms of the policy before you sign.

仔细阅读保险单的条款后再签字。《牛津词典》

标志

1·A small sign was attached to the wall with peeling Sellotape.

一个小标志被双面胶粘在墙上。《柯林斯英汉双解大词典》

2·The chevron or arrow road sign indicates a sharp bend to the left or right.

V形或箭头交通标志表示左方或右方有急转弯。《柯林斯英汉双解大词典》

3·A telling sign of misplaced priorities is the concentration on health, not environmental issues.

首要问题定位不当的一个显著标志就是专注于健康而非环境问题。《柯林斯英汉双解大词典》

4·This is a sign of anxiety.

这是焦虑的一个标志。

5·The sign reads Keep Left.

标志内容是请保持向左。

迹象

1·Headaches may be a sign of stress.

头痛可能是紧张的迹象。《牛津词典》

2·The snow showed no sign of melting.

雪没有一点融化的迹象。《牛津词典》

3·It's a sure sign of economic recovery.

这是经济复苏的确切迹象。《牛津词典》

4·The gloomy weather shows no sign of improving.

阴沉的天气没有丝毫转晴的迹象。《牛津词典》

5·There is no sign of a let-up in the recession.

经济衰退没有减弱的迹象。《牛津词典》

签署

1·They will sign the union treaty only on their terms.

他们在符合自己意愿的条件下才会签署联合条约。《柯林斯英汉双解大词典》

2·Democratic leaders have challenged the president to sign the bill.

民主党领导人对总统签署这项法案存有质疑。《柯林斯英汉双解大词典》

3·They are demanding certain guarantees before they sign the treaty.

他们要求得到某些保证后才签署条约。《牛津词典》

4·World leaders are expected to sign a treaty pledging to increase environmental protection.

人们期望世界领导人们能签署一份承诺加强环境保护的条约。《柯林斯英汉双解大词典》

5·We still have some outstanding issues to resolve before we'll have a treaty that is ready to sign.

我们在签署这份条约之前还有一些悬而未决的问题要解决。《柯林斯英汉双解大词典》

信号

1·The fact that they had decided to come was interpreted as a positive sign.

他们已经决定要来的事实可被解释为一个积极的信号。《柯林斯英汉双解大词典》

2·Surely that's a positive sign.

毫无疑问，这是一个积极的信号。

3·But surely that's a positive sign.

但毫无疑问，这是一个积极的信号。

4·It's a sign that people are interested and want to hear what you say.

这是一个信号，表明人们对你所说的话感兴趣，想要听到你说的话。

5·In adulthood, looking someone else in a pleasant way can be a complimentary sign of paying attention.

成年后，以一种友好的方式看着别人可能是一种关注他人时表示敬意的信号。

签

1·I had no choice but to sign the contract.

我别无选择，只好签了合同。《牛津词典》

2·You must sign guests out when they leave the club.

客人离开俱乐部时，你必须为他们签退。《牛津词典》

3·Only the manager has the authority to sign cheques.

只有经理才有权签支票。《牛津词典》

4·I was forced to sign the agreement against my will.

我被迫违心地签了这份协议。《牛津词典》

5·She more than anyone had hastened to sign the contract.

她比任何人都急着去签那份合同。《柯林斯英汉双解大词典》

符号

1·This was because each sign, or letter, represented only one sound in their language.

这是因为在他们的语言中，每个符号或字母只代表一种声音。

2·It is locally convex in the sense that it has no loops and the curvature never changes sign.

它的局部是凸的，因为它没有环路，且曲率永远不会改变符号。

3·A more economical approach was to use a sign to express not a whole word but a single syllable.

更经济的方法是使用一个符号来表达一个音节，而不是一个完整的单词。

4·The brownie and pineapple cheesecake have a marginal value, because their value is at the limit of their sign constraints.

布朗尼和菠萝芝士蛋糕都有一个临界值，因为它们的值受到了符号约束的限制。

5·Members of the group were born deaf and never learned Spanish or a formal sign language, but they have developed a gesture system to communicate with people around them.

研究人群天生就是聋子，从没有学过西班牙语或其它正式的符号语言，但是他们有一套能让他们与周围人沟通的手语系统。

签名

1·Their battle cry will be: Sign this petition before they sign away your country.

他们呐喊的是：“在他们卖国之前，在请愿书上签名。”《柯林斯英汉双解大词典》

2·Then all three of you sign the contract and post in on the fridge.

然后你们三个人要都在协议上签名，并把它贴在冰箱上。

3·Where can I sign?

我应在哪里签名？

4·To perform this workaround, you need to have the right to sign agents that run on behalf of someone else.

为了实施这个变通方法，需要具有对代表其他用户运行的代理进行签名的权限。

5·No permission to sign agents that run on behalf of someone else.

不允许为代表其他用户运行的代理进行签名。

征兆

1·The fact that he didn't say 'no' immediately is a good sign.

他没有马上拒绝，这是好征兆。《牛津词典》

2·Tiredness and fever are much more likely to be a sign of the flu coming on.

疲倦和发烧很有可能是流感开始的征兆。《柯林斯英汉双解大词典》

3·Recent decisions by Hamilton and others may be a sign that people are starting to realize that there's this destructive competition going on, says Baum.

“汉密尔顿和其他人最近的决定可能是一个征兆，表明人们开始意识到这种恶性竞争正在持续。”鲍姆说。

4·I have a hundred things to write to you, great and small, if only I could do it neatly, but my writing grows more and more indistinct, a sign, I fear, of heart weakness.

我有很多很多的事想在信里向你倾诉，有大事也有小事，要是我能写得工整一些就好了，但我的字迹变得越来越难以辨认，我担心这是心脏衰竭的征兆。

5·But in an ominous sign for them, the new Congress is already shifting its emphasis.

而新国会已经开始转移其工作重心，这对他们而言是一个不详的征兆。

牌子

1·The sign on the wall said 'Now wash your hands'.

墙上的牌子上写着“请洗手”。《牛津词典》

2·Look at the sign — We'll never give up.

看看这个牌子——“我们永不放弃”。

3·A sign over a door read Navid's Tea Shop.

门上有个牌子写着“纳维德茶叶店”。

4·As I approached mile 23, I could see my wife waving a sign.

在接近23英里时，我看到我的妻子挥舞着一个牌子。

5·I asked him about the new sign, and he said, You kids are stealing too much stuff.

我问他新牌子的事，他说：“你们这些孩子已经偷了很多东西了。”

(1)sign up签约雇用，签约参加

(1)sign on开始广播；签约雇用

(1)sign for签收

(1)sign in签到；注册；登记；签收

(1)sign up for注册，选课；报名参加

(1)sign language手语；符号语言