名词
中文翻译：信号
同义词：
['sign', 'indicator', 'beacon', 'cue']
例句：
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1. The traffic officer waved his hand to signal the cars to stop.
交通警察挥动手示意车辆停下。
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2. The radio station used a flashing light as a signal to alert listeners.
电台使用闪烁的灯光作为警示信号提醒听众。
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3. The policeman walked over to the car and signaled it to stop.
警察走到汽车旁，示意它停下。