名词
中文翻译：信号
同义词：
['beacon', 'indicator', 'cue', 'signal light例句：1. The policeman used his flashlight to signal the driver to stop.（警察用他的手电筒向司机示意停车。）']
例句：
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1. The policeman used his flashlight to signal the driver to stop.
警察用他的手电筒向司机示意停车。
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2.The ship's radio was a beacon in the dark night.
船上的无线电是黑夜中的灯塔。
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3. The traffic officer waved his hand as a signal for the cars to slow down.
交通官员挥手作为车辆减速的信号。