名词
中文翻译：信号
同义词：
['flag', 'beacon', 'signal light']
例句：
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1. The ship's horn is a loud signal to alert other ships.
船的号角是向其他船只发出警报的响亮信号。
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2. The policeman used his flashlight as a signal to stop the traffic.
警察用他的手电筒作为停止交通的信号。
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3. The firefighters used smoke signals to guide the rescuers.
消防员使用烟雾信号来指导救援人员。