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IELTS BNC: 1960 COCA: 2078
*signal
/ˈsɪgnəl ||; ˈsɪgnḷ/noun[C]
1 a sign, action or sound that sends a particular message 信号；暗号: When I give (you) the signal, run! 我一发出信号，你就跑！
2 an event, action or fact that shows that sth exists or is likely to happen 标志；表示: The fall in unemployment is a clear signal that the economy is improving. 失业率下降明确标志着经济在改善。
3 a set of lights used to give information to train drivers 铁路信号灯
4 a series of radio waves, etc that are sent out or received （无线电波等传送的）信号: a signal from a satellite 恒星信号 signal verb [I,T] (signalling;signalled (US 美) signaling;signaled) She was signalling wildly that something was wrong. 她拚命示意出了事。
IELTS BNC: 1960 COCA: 2078
signal1/ˋsIgnḷ; ˈsIɡn$l/ n [C]1 a sound or something that you do to give information or to tell someone to do something 信号﹔暗号: signal (for sb) to do sth That was the signal for me to switch out the lights. 那是让我关灯的信号。The headmaster gave the signal to start. 校长示意开始。2 something which shows what someone feels, what exists, or what is likely to happen 信号﹔标志﹔预兆: +that The result is a clear signal that voters are not happy. 这一结果清楚显示选民不满意。This will send the wrong signal to potential investors. 这会给潜在投资者错误的信号。3 a series of light waves, sound waves etc that carry information to a radio, television etc〔无线电﹑电视等的〕信号﹐讯号: send/transmit/emit a signal Signals are sent via satellite. 讯号是通过卫星传送的。receive/pick up/detect a signal a small antenna which receives radio signals 接收无线电讯号的小型天线4 a piece of equipment that tells a train driver whether to go or stop 铁路信号TURN SIGNAL
signal2 v signalled , signalling BrE 【英】; signaled , signaling AmE 【美】1 [I,T] to move your hand, head etc as a way of telling someone something 发信号﹐打信号﹔示意: +to/for Tom signalled for the bill. 汤姆示意结账。signal (to) sb to do sth She signalled to the children to come inside. 她示意孩子们进来。 2 [T] to be a sign or proof of something happening 标志着﹐证明: The elections signalled the end of a nine-year civil war. 大选标志着九年内战的结束。 3 [T] to make something clear by what you say or do〔用语言或行动〕表明﹐表示: Carter has signalled his intention to resign. 卡特表示他有意辞职。
IELTS BNC: 1960 COCA: 2078
signal signalsignalssignalledsignaledsignallingsignaling nouna light, sound or movement that tells you something without words: A red light is a signal for cars to stop.▶ signal verb (British)signals, signalling, signalled ) (American signaling, signaled): The policeman signalled to the children to cross the road.

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