名词
中文翻译：信号
同义词：
['beacon', 'indicator', 'cue', 'signal', 'indication']
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 forpedestrians crossing the street.
交通灯是行人过马路的常见信号。
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3. The pilotused a flare to signal the plane's altitude and direction.
飞行员用信号弹指示飞机的高度和方向。