名词
中文翻译：信号
同义词：
['sign', 'indicator', 'beacon', 'signal light']
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 ship's horn is a common signal for distress.
船的汽笛是求救的常见信号。
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3. The pilot used a flare to signal the approach of an airplane.
飞行员使用信号弹来指示飞机的到来。