名词
中文翻译：信号
同义词：
['beacon', 'indicator', 'cue']
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示意司机停车。
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2.The ship's flag is a traditional signal for distress.
船旗是传统上表示求救的信号。
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3. The pilot used a flare to signal the approach of an emergency landing.
飞行员使用信号弹来指示紧急着陆的临近。