Each memory block can have only one global backup.

每个内存块只能有一个全局备份。

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In order to ensure that the global warehouse maintains a backup list of the customers with bad credit or bankruptcy records, the warehouse credit officer creates a local table named BAD_CUSTOMERS.

为了确保全球仓库维护一份有不良信用或破产记录的客户名单，仓库信用调查分析人员创建一个名为BAD_CUSTOMERS的本地表。

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Metro Mirror is used to replicate to the first backup, and then Global Mirror is used to replicate from the first backup to a second backup.

Metro Mirror用于对数据进行第一次备份，再由Global Mirror复制第一次备份作为第二次备份。

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Just one year ago, the Bush administration announced it would keep the ground-based LORAN system operational to serve as a backup for the satellite-based global positioning systems, which are becoming ubiquitous in cars, planes and ships.

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