名词
中文翻译：信号
同义词：
['sign', 'indicator', 'beacon']
例句：
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1.The policeman used his flashlight to signal the driver to stop.
警察用他的手电筒示意司机停车。
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2. The traffic light is a common signal for pedestrians crossing the street.
交通信号灯是行人过马路的常见标志。
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3. The pilot used a signal to guide the plane safely into the runway.
飞行员使用信号引导飞机安全地进入跑道。