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1. The extension bell is a device that can be attached to a telephone line to extend the rangeof its signal.
扩展铃是一种可以连接到电话线路上的设备，以延长其信号的范围。
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2. The extension bell helps to alert people in remote areas when there's an emergency.
扩展铃在紧急情况下帮助提醒偏远地区的人们。
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3. The extension bell is often used in hospitals to alert patients and staff about important information.
扩展铃在医院中常被用来提醒患者和工作人员关于重要信息。