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.
警察用他的手电筒示意司机停车。
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2. The traffic light is a common signal for pedestrians crossing the street.
交通灯是行人过马路的常见信号。
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3. The GPS system uses signals from satellites to guide navigation.
全球定位系统利用来自卫星的信号来导航。