名词
中文翻译：紧急号角
同义词：
['emergency signal', 'emergency bell']
例句：
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1.The fire department used an emergency horn to alert the public.
消防部门使用一个紧急号角来警告公众。
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2.The hospital had an emergency bell that could be heard from a distance.
医院有一个可以远距离听到的紧急铃。
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3. The old man kept his emergency bell handy in case of emergencies.
老人总是随身携带他的紧急铃，以防万一。