keep-alive voltage

例句：

1. 1. The medical team used a special device to keep the patient's heart rate at a safe level.
   医疗团队使用一种特殊的设备，使患者的心率保持在安全水平。
2. 2.The power supply must maintain a high voltage to ensure the equipment's operation.
   电源必须保持高电压，以确保设备的正常运行。
3. 3.In order to save lives, the hospital kept-alive voltage levels were carefully monitored.
   为了拯救生命，医院密切监控了维持生命电压的水平。