名词
中文翻译：信号
同义词：
['sign', 'indicator', 'beacon']
例句：
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1.The traffic policeman used his flashlight to signal the driver to stop.
交通警察用他的手电筒向司机示意停车。
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2.The ship's horn is a common signal for distress.
船的号角是求救的常见信号。
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3. The pilot used a red flare as a signal to land the plane safely.
飞行员用红色烟雾作为信号，安全降落飞机。