名词
中文翻译：信号
同义词：
['notification', 'indicator', 'cue', 'signal', 'beacon']
例句：
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1. The policeman used his whistle to signal the driver to stop.
警察用哨子示意司机停车。
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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 new sign at the entrance of the mall is a clear signal that it's open now.
商场入口的新标志清楚地表明现在开放了。