名词
中文翻译：信号
同义词：
['sign', 'indicator', 'beacon']
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 traffic light is a common signal for crossing the street.
交通灯是过马路的常见信号。
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3.The radio station uses different signals to attract listeners.
电台使用不同的信号来吸引听众。