名词
中文翻译：紧急信号
同义词：
['emergency notification', 'emergency alert']
例句：
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1. In case of an emergency, the fire department will send a signalling device to warn people.
在紧急情况下，消防部门将发送一个信号设备来警告人们。
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2. The company has implemented a system for emergency signalling during emergencies.
该公司已经实施了一套系统，用于在紧急情况下进行紧急信号通知。
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3. The police issued an emergency signalling to alert drivers to slow down and stop at the red light.
警方发布了紧急信号通知，提醒司机在红灯处减速并停车。