名词
中文翻译：Unknown
同义词：
['notification', 'indicator', 'beacon', 'cue']
例句：
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1. The policeman used his flashlightto signal the driver to stop.
警察用他的手电筒示意司机停车。
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2. Thetraffic light is a common signal for pedestrians crossing the street.
交通灯是行人过马路的常见信号。
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3. Thepilot used a flare tosignal the plane to land.
飞行员用信号弹指示飞机降落。