名词
中文翻译：信号
同义词：
['notice', 'indicator', 'beacon', 'signal light']
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 is a signal for other ships to avoid collision.
船的号角是其他船只避免碰撞的信号。
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3. The traffic lights are designed to signal when to stop and when to go.
交通灯的设计是为了指示何时停车和何时行驶。