[计] 备份设备

alternate device的用法和样例：

例句

Patients were excluded if a laser-assisted device had been utilized during the arthroscopy.排除那些在关节镜检术中使用了激光辅助设备的患者。
Prepare a backup device for the instance and application databases.为实例数据库和应用程序数据库准备备份设备。
A disk backup device is a hard disk or other disk storage media that contains one or more backup files.磁盘备份设备是指包含一个或多个备份文件的硬盘或其他磁盘存储媒体。

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