名词
中文翻译：信号警报同义词
同义词：
['alarm signal', 'warning signal']
例句：
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1. The police were signaling the driver to stop.
警察正在向司机发出停止的信号。
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2. The fire department received a signal alarm about the fire.
消防部门收到了关于火灾的警报信号。
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3. The pilot noticed an unusual signal alarm in the sky.
飞行员注意到天空中出现了异常的警报信号。