signals

1. [C] 信号,暗号 sth intended to warn command, or give a message, such as a special sound or action
2. [C] (无线电或电视所传送的)讯号,信息,图像 a sound, image, or message sent by waves, as in radio or television

1. vt. & vi. 发信号,用信号传达,用信号通讯 make a signal or signals; send or express (sth) in this way; communicate with (sb) in this way

• 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

• 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

• 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

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

• 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

• 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

• signal position示意位置

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

• 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

communication signals 通信信号（communication signal的复数形式）

signals and systems信号与系统

1. A red lamp is often a danger signal.
   红灯常常是危险的信号。
2. I corrected my watch by the time signal.
   我按报时信号校正我的表。
3. 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。
4. 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。
5. 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。

1. 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。
2. The submarine signaled for help.
   潜水艇发出求救的信号。

1. 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。
2. This is a signal success.
   这是显著的成功。