名词
中文翻译：信号
同义词：
['flag', 'beacon', 'indicator']
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 signals when it's time for us to cross the street.
交通灯指示我们过马路的时间。
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3. The pilot used a red signal to warn other planes of an impending storm.
飞行员用红色信号警告其他飞机即将来临的暴风雨。