名词
中文翻译：信号
同义词：
['sign', 'indicator', 'beacon']
例句：
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1.The police officer used a flashlight to signal the driver to stop.
警察用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 radio station uses a special code to signal emergency situations.
电台使用特殊代码来标示紧急情况。