名词
中文翻译：紧急信号
同义词：
['urgent signal', 'emergency warning']
例句：
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1.The police used an emergency signal to alert the public about the danger.
警方使用紧急信号来警告公众危险。
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2. The fire department responded quickly with an emergency signal to warn everyone to evacuate the building.
消防部门迅速响应，用紧急信号警告所有人撤离大楼。
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3. The doctor gave her a stern look and issued an emergency signal for medical help.
医生严厉地看了她一眼，发出了紧急信号请求医疗帮助。