名词
中文翻译：信号箱
同义词：
['alert box', 'warning box', 'signaling box']
例句：
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1.The policeman used his signal box to warn the driver of the approaching traffic.
警察用他的信号箱警告司机前方有来车。
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2.The engineer had to change the signal box because it was broken.
工程师不得不更换信号箱，因为它坏了。
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3. The firefighters used their signal boxes to alert the public about the fire danger.
消防员使用他们的信号箱向公众发出火灾危险的警报。