名词
中文翻译：警报器
同义词：
['alarm bell', 'alarm clock']
例句：
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1. The policeman rang the alarm to warn everyone of the impending danger.
警察拉响了警报，警告大家即将到来的危险。
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2. The old man was so frightened by the sudden noise that he dropped his cup and ran out ofthe room.
老人被突然的响声吓得杯子都掉在地上，跑出了房间。
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3.The fire department arrived at the scene just in time to save the lives of all the people inside the building.
消防队及时赶到现场，救出了建筑内所有人的生命。