名词
中文翻译：警告手
同义词：
['alarm', 'warning hand']
例句：
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1. The alarm hand on the doorbell is a signal that someone is at the door.
门铃上的报警器是一个有人按门铃的信号。
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2. The fire department arrived quickly to put out the fire with their alarm hand.
消防队迅速赶到，用他们的警报器扑灭了火。
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3. The elderly man was using his alarm hand to signal for help.
那位老人正在使用他的警报器来发出求救信号。