名词
中文翻译：警报信号
同义词：
['alert signal', 'warning signal例句：1. The police received a ringing signal from the tower.（警察从塔收到了一个紧急的信号。）']
例句：
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1. The police received a ringing signal from the tower.
警察从塔收到了一个紧急的信号。
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2. He pressed the button on his phone to send a ringing signal.
他按了一下手机的按钮发送了一个紧急信号。
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3. The fire department responded to the scene with a ringing signal.
消防部门接到了现场的一个紧急信号。