名词
中文翻译：信号
同义词：
['message', 'indicator', 'indication']
例句：
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1.The policeman gave a signal to the driver to stop.
警察向司机发出了停止的信号。
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2. The traffic light is a common signal for cars to stop.
交通灯是汽车停下来的常见信号。
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3. The pilot used a signal to guide the plane safely back to the runway.
飞行员使用信号来指导飞机安全地返回跑道。