名词
中文翻译：信号
同义词：
['notice', 'signal', 'indicator', 'beacon']
例句：
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1. The police used a flashing light to signal the driver to stop.
警察使用一个闪烁的灯光来示意司机停车。
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2. The traffic officer waved his hand as a signal for the cars to slow down.
交通官员挥手示意车辆减速。
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3. The ship's horn was a loud signal that it was time to dock.
船的汽笛声是一个响亮的信号，表明是登船的时间了。