名词
中文翻译：信号
同义词：
['sign', 'indicator', 'beacon', 'signal light']
例句：
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1.The policeman used a flashlight to signal the driver to stop.
警察用手电筒示意司机停车。
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2. The ship's horn is a common way for ships to signal each other.
船的号角是船只之间常见的通信方式。
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3.The traffic officer waved his hand to signal the pedestrians to cross the street.
交通警察挥挥手示意行人过马路。