名词信号，暗号; 预兆，征象; 动机; 导火线
及物动词向…发信号; 用动作（手势）示意; 以信号告知
不及物动词发信号
形容词显著的，优越的; 暗号的，作信号用的
signal
及物动词
1. A period signals the end of a sentence.
句号表示一个句子结束了。
不及物动词
1. signal是什么意思
1. The teacher signalled to the boy to begin.
老师向那个男孩做手势，叫他开始。
名词
1. A red lamp is used as a danger signal.
红灯用作危险信号。
2. The railway signal showed that the train could pass.
铁路的信号标志显示火车可以通过。
1. 符号：传播的来源与日地分别是独特的个体,各有其经验范围:双方经验中交集的部分,即为讯息(message)基本来源的符号(signal). 传播双方则各自是编码、释码,与解码的系统;双方透过回馈控制过程,讯息得以了解及传布. 自施兰姆引进新的传播理论之后,
2. signal：sgl; 信号
3. signal：sig; 声音信号
1. (以手势、声音、行动等发出的)信号，暗号
A signal is a gesture, sound, or action which is intended to give a particular message to the person who sees or hears it.
e.g. They fired three distress signals...
他们发射了3次求救信号。
e.g. 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。
2. (用手势、声音等)发信号，发暗号，示意
If you signal to someone, you make a gesture or sound in order to send them a particular message.
e.g. The United manager was to be seen frantically signalling to McClair...
一会儿可以看到曼联主教练拼命地朝麦克莱尔示意。
e.g. 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。
3. 迹象;信号;预示
If an event or action is a signal of something, it suggests that this thing exists or is going to happen.
e.g. 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。
e.g. The first warning signals came in March...
第一次警示出现在3月份。
4. 预示;表明;显示
If someone or something signals an event, they suggest that the event is happening or likely to happen.
e.g. She will be signalling massive changes in energy policy...
她将暗示能源政策会有重大变化。
e.g. Britain was signalling its readiness to have the embargo lifted...
英国表示愿意取消贸易禁令。
5. (铁路上的)指示灯，信号灯
A signal is a piece of equipment beside a railway, which indicates to train drivers whether they should stop the train or not.
signal
6. (传输信息的无线电、光波或电流)信号
A signal is a series of radio waves, light waves, or changes in electrical current which may carry information.
e.g. ...high-frequency radio signals.
高频无线电信号
7. 重大的;显要的;非凡的
You use signal to describe a success or failure when you are emphasizing the fact that it has occurred and are indicating that the consequences are significant.
e.g. 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。
e.g. ...John Major's signal failure to grab America's attention.
约翰·梅杰显然没有能够引起美国的注意