名词
中文翻译：空袭警报
同义词：
['air raid warning', 'air raid siren']
例句：
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1.The school has installed an air raid alarm system to alert students in case of an emergency.
学校安装了防空警报系统，以在紧急情况下提醒学生。
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2. The city has issued a new air raid siren to help people prepare for the possibility of an imminent attack.
该市发布了新的防空警报器，以帮助人们为可能的袭击做好准备。
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3.During World War II, air raid alarms were used to warn citizens of approaching bombers.
二战期间，防空警报被用来警告市民即将到来的轰炸机。