名词
中文翻译：信号
同义词：
['notification', 'indicator', 'beacon']
例句：
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1.The policeman signaled for the driver to stop.
警察示意司机停车。
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2. The traffic 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. The radio station uses signals to guide listeners through their programming.
电台通过信号指导听众收听节目。