名词
中文翻译：信号
同义词：
['notification', 'indicator', 'beacon']
例句：
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1. The policeman used his whistle tosignal the driver to stop.
警察用哨子示意司机停车。
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2. The traffic light isa common signal for pedestrians crossing thestreet.
交通灯是行人过马路的常见信号。
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3. The new sign at the entranceof the museum was meant to signal visitorsabout the exhibits.
博物馆入口的新标志是为了向游客指示展览内容。