音标：['signl] ；柯林斯词典等级：3 级；牛津三千核心词汇；

n. 信号, 暗号, 近因, 导火线
vt. 向...作信号, 标志, 用信号通知
vi. 发信号
a. 作为信号的, 显著的
[计] 信号

n. any nonverbal action or gesture that encodes a message
n. any incitement to action
n. an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes
s. notably out of the ordinary

词型变化：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
考试类型：[高考/四级/六级/考研/IELTS/GRE]

词性分布：

名词70%

动词30%

signal的用法和样例：

例句

用作名词(n.)

A red lamp is often a danger signal.红灯常常是危险的信号。
I corrected my watch by the time signal.我按报时信号校正我的表。
I've called several times, but I keep getting a busy signal.我打了好几次了,可是一直是忙音。
We live too far from the city to get a strong television signal.我们住的地方离城里太远, 不能收到清晰的电视图像。
Her speech yesterday is a signal that her view has changed.她昨天的讲话标志著她的观点已经转变。

用作动词(v.)

The police signalled the traffic to move forward slowly.警察向来往车辆打信号，示意缓慢前行。
The submarine signaled for help.潜水艇发出求救的信号。

用作形容词(adj.)

People speak of Mark Twain as a signal humourous writer.人们称马克·吐温为杰出的幽默作家。
This is a signal success.这是显著的成功。

常见句型

用作名词(n.)

Signals are made with flags or lamps.用旗或灯传递信号。
We live too far from the city to get a strong television signal.我们住的地方离城里太远,不能收到清晰的电视图像。

用作动词(v.)

用作不及物动词S+～(+A)

She is signaling.她正在发送信号。
The submarine signaled for help.潜水艇发出求救的信号。

用作及物动词S+～+ n./pron.

She signaled the advance.她发出信号前进。
A bell signals the end of a school period.铃声标志着学校里一节课的结束。

S+～+that-clause

She signaled that he was about to turn left.她打信号灯表示他就要转到左面去了。

S+～+wh-clause

They signaled which way one is going to turn?他们打信号示意走哪一条路。

用作双宾动词S+～+ pron./n. +to n./pron

He signaled a message to his brother.他用信号向他哥哥发信息。

S+～+(to) n./pron. +to- v

He signaled the waiter to bring the menu.他做手势要侍者拿菜单来。
The conductor signaled the orchestra to rise.指挥打手势让乐队起立。
Jim signaled his helplessness to Mary to leave the party.吉姆无法从宴会脱身时,他向玛丽使了个眼色,表示无可奈何。

S+～+(to) n./pron. +wh-to- v

Tom signaled his friend which way to go.汤姆示意他的朋友走哪条路。

词汇搭配

用作名词 (n.)

动词+～

catch the signal见到那信号
give〔ignore〕 a signal给〔忽视〕信号
produce signals产生信号
put up〔send〕 a signal发信号
receive signals接收信号
repeat〔respond to〕 a signal重复〔回答〕信号
show a signal显示信号

形容词+～

audible〔clear〕 signal听得见〔清楚〕的信号
auditory〔calling, visual〕 signal声音〔呼叫,视觉〕信号
unmistakable〔weak〕 signal明确无误〔微弱〕的信号

名词+～

alarm〔caution, danger〕 signal警报〔警戒,危险〕信号
color light signals彩色灯信号
fire〔fog, storm〕 signal火灾〔起雾,暴风雨〕信号
home〔railroad〕 signal进站〔铁路〕信号
input〔output〕 signals输入〔输出〕信号
picture signals图像信号
radar signal雷达脉冲
traffic signal〈美〉交通信号

～+名词

signal generator〔lamp, pistol〕信号发生器〔灯,枪〕

介词+～

at a signal在信号发出时
begin at a signal在信号发出时开始
ask by signal用信号发问
on a signal在信号发出时

～+介词

signal by sounding a bell以铃声为信号
signal for a retreat撤退信号
signal from发自…的信号
signal in code编码信号
signal of danger危险的信号
signal to发往…的信号

用作动词 (v.)

～+名词

signal position示意位置

～+副词

signal wildly乱发信号
signal out a distress signal发出遇难信号

～+介词

signal for为(某事)而发信号
signal for help发信号求救
signal with flags用旗子当信号

经典引文

Her sobs..became more subdued..a signal to Dan that she would soon relent.
出自：E. Caldwell
Sterling M3..had given misleading signals.
出自：Times
Signal villains of every class.
出自：John Foster
To have done this at all would be a signal achievement.
出自：K. Tynan
Seeing him enter the room..she signalled him to approach.
出自：P. G. Wodehouse
Threw open the door and signalled the escort captain.
出自：B. Malamud

【近义词】

indication
sign

gesture
motion

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