名词
中文翻译：信号
同义词：
['sign', 'indicator', 'beacon']
例句：
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1. Thepoliceman used his flashlight to signalthe driver to stop.
警察用他的手电筒向司机示意停车。
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2. The trafficlight is a common signal for pedestrianscrossing the street.
交通灯是行人过马路的常见信号。
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3. The pilot used asignal to guide the plane safely into therunway.
飞行员使用信号引导飞机安全地进入跑道。