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发出响亮尖利声音的警报信号。
So they had bypassed the warning signal.
youdao
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确保所有警报信号都开着。
Make sure all alarms are on.
youdao
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了解一下大楼里的火警警报信号在哪里。
Learn where the fire alarm is in the building.
youdao
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这是警报信号。
It's the alert signal.
youdao
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这是警报信号。
It's the alert signal.
youdao