名词
中文翻译：信号
同义词：
['message', 'indicator', 'sign', 'indication例句：1. The policemanused his flashlight to signal the driverto stop.（警察用他的手电筒来示意司机停车。）2. The traffic light isa common signal for crossing the road.（交通灯是过马路的常见信号。）']
例句：
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1. The policemanused his flashlight to signal the driverto stop.
警察用他的手电筒来示意司机停车。
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2. The traffic light isa common signal for crossing the road.
交通灯是过马路的常见信号。
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3. Thenew system uses signals to communicate with eachother.
新系统使用信号相互通信。