名词
中文翻译：信号
同义词：
['beacon', 'indicator', 'lighthouse', "signal light例句：1. The policeman used his flashlight to signal the driver to stop.（警察用他的手电筒来示意司机停车。）2. The ship's horn was a constant source of warning for all on board.（船的号角是船上所有人员不断发出的警告声。）"]
例句：
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1. The policeman used his flashlight to signal the driver to stop.
警察用他的手电筒来示意司机停车。
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2. The ship's horn was a constant source of warning for all on board.
船的号角是船上所有人员不断发出的警告声。
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3.The beacon on the mountain is a vital tool for navigation.
山丘上的灯塔是导航的重要工具。