signal

n.信号，暗号；预兆，征象；动机；导火线

vt.向…发信号；用动作（手势）示意；以信号告知

vi.发信号

adj.显著的，优越的；暗号的，作信号用的

noun

1. 信号；暗号
   a movement or sound that you make to give sb information, instructions, a warning, etc.
   1. a danger/warning/distress etc. signal
      危险、警告、求救等信号
   2. At an agreed signal they left the room.
      收到约定的信号后，他们离开了房间。
   3. The siren was a signal for everyone to leave the building.
      警报器一响，就是要所有人离开大楼。
   4. When I give the signal , run!
      我一发信号，你就跑！
   5. All I get is a busy signal when I dial his number (= his phone is being used) .
      我什么时候拨他的电话听到的都是忙音。
   6. hand signals (= movements that cyclists and drivers make with their hands to tell other people that they are going to stop, turn, etc.)
      骑车人和驾车人的示意手势
2. 标志；预示；信号
   an event, an action, a fact, etc. that shows that sth exists or is likely to happen
   1. The rise in inflation is a clear signal that the government's policies are not working.
      通货膨胀率的上升清楚地表明，政府的政策不起作用。
   2. Chest pains can be a warning signal of heart problems.
      胸部疼痛可能是心脏病的报警信号。
   3. Reducing prison sentences would send the wrong signals to criminals.
      减刑会向犯罪分子发出错误的信号。
3. （尤指铁路和公路上的）指示灯，信号灯，红绿灯
   a piece of equipment that uses different coloured lights to tell drivers to go slower, stop, etc., used especially on railways/railroads and roads
   1. traffic signals
      交通信号灯
   2. a stop signal
      停车信号
4. （传输声音、图像或其他信息的电波）信号
   a series of electrical waves that carry sounds, pictures or messages, for example to a radio or television
   1. TV signals
      电视信号
   2. a high frequency signal
      高频信号
   3. a radar signal
      雷达信号
   4. to detect/pick up signals
      探测 / 收到信号
   5. to emit a signal
      发射信号

verb

1. 发信号；发暗号；示意
   to make a movement or sound to give sb a message, an order, etc.
   1. Don't fire until I signal.
      等我发出信号后再开枪。
   2. Did you signal before you turned right?
      右转弯前你示意了吗？
   3. He signalled to the waiter for the bill.
      他示意服务员结账。
   4. The referee signalled a foul.
      裁判鸣哨示意犯规。
   5. She signalled (that) it was time to leave.
      她示意该走了。
   6. He signalled to us to join him.
      他示意要我们去他那儿。
   7. She signalled him to follow.
      她示意他跟她走。
   8. You must signal which way you are going to turn.
      你要朝哪个方向转，必须发出信号。
2. 标志；表明；预示
   to be a sign that sth exists or is likely to happen
   1. This announcement signalled a clear change of policy.
      这个声明显示政策有明显的改变。
   2. The scandal surely signals the end of his political career.
      毫无疑问，这桩丑闻预示他的政治生涯就此结束。
3. 表达；表示；显示
   to do sth to make your feelings or opinions known
   1. He signalled his discontent by refusing to vote.
      他拒绝投票以示不满。
   2. She has signalled (that) she is willing to stand as a candidate.
      她表示愿意作为候选人参加竞选。

adj.

1. 重大的；显要的
   important
   1. a signal honour
      极大的荣誉

名词复数形式:signals 过去式:signalled 过去分词:signalled 现在分词:signalling 第三人称单数:signals

signal 信号，暗号，标记，表明

sign,标记，记号，-al,名词后缀。引申词义信号，暗号等。

1. The flow of current actuates the signal.
   电流发出了信号。
2. When we turned the boat about, the signal began to bleep again constantly.
   当我们把船调头的时候，信号器又不停地发出哔哔声。
3. The coded signal is received by satellite dish aerials.
   编码信号由碟形卫星天线接收。
4. The signal will be converted into digital code.
   信号会被转变为数字代码。
5. Hunger is the body's signal that levels of blood sugar are too low
   饥饿感是身体发出的信号，表示血糖水平太低。
6. The red signal means you can shoot.
   红色信号表示可以射击。
7. The crew of Philante picked up a distress signal from the yacht Sans Peur III.
   “菲蓝特”的船员接收到了“无畏者三号”游艇发出的遇险信号。
8. A radio signal has both electrical and magnetic properties.
   无线电信号具有电、磁双重属性。
9. The reception was a little faint but clear enough for him to receive the signal.
   接收到的信号有点弱，但对他来说已够清晰，可以接收到。
10. This act was a signal to his victim's friends that he was someone to be reckoned with
    此举等于告诉其受害者的朋友们他不好对付。
11. Then the rain came and the red flag went up to signal a halt.
    然后下雨了，红旗升起示意暂停。
12. The transmitters will send a signal automatically to a local base station
    发射台会自动将信号发射到地方基站。
13. As soon as it was dark, Mrs Evans gave the signal
    天一黑，埃文斯夫人就发出了信号。
14. You mustn't fire without my signal.
    没我的信号不许开枪。
15. He stood up, signalling to the officer that he had finished with his client
    他站起身，向警察示意他和他的当事人已经谈完了。
16. She signalled a passing taxi and ordered him to take her to the rue Marengo.
    她招手打了一辆路过的出租车，让司机载她去马伦戈街。
17. Kurdish leaders saw the visit as an important signal of support
    库尔德领导人将这次访问视作一种表示支持的重要信号。
18. The first warning signals came in March
    第一次警示出现在3月份。
19. The Red Cross said it is withdrawing its staff until they receive clear signals from all sides that their presence is welcomed.
    红十字会称他们正在撤回所属职员，直到各方都明确表示欢迎他们的存在。
20. She will be signalling massive changes in energy policy
    她将暗示能源政策会有重大变化。
21. Britain was signalling its readiness to have the embargo lifted
    英国表示愿意取消贸易禁令。
22. The outcome of that meeting could signal whether there truly exists a political will to begin negotiating.
    那次会议的结果会表明是否真正存在想要开始谈判的政治意愿。
23. His final round was a signal triumph in a career marked by many sweet moments.
    最后一场比赛的胜利在他充满欣喜的职业生涯中具有非凡的意义。
24. The bomb attack on the capital could signal the start of a pre-election terror campaign.
    对首都的炸弹袭击可能标志着选举前的恐怖活动开始了。
25. A thin cable carries the signal to a computer
    一根细电缆将信号传送给一台计算机。
26. the first transatlantic radio signal.
    首个跨越大西洋的无线电信号
27. A train must not pass a signal that is at danger.
    火车切不可越过危险信号。
28. This is a signal of the urgent urgency from Field Army Headquarters.
    这是野战军首长拍来的十万火急的电报。
29. Here's the decoded signal.
    这是经过破译的信号。