由于存取实际数据的责任由数据库系统承担，因此程序员就可以不考虑实际的数据结构。

Since the responsibility for accessing the physical data rests with the database management system, the programmer can ignore the physical data structure.

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平衡数据可用性、存取性能以及构建和维护成本是设计远程镜像系统必须仔细考虑的。

Balancing the data availability, access performance and the cost of building and maintaining is essential goal for designing remote mirroring system.

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平衡数据可用性、存取性能以及构建和维护成本是设计远程镜像系统必须仔细考虑的。

Balancing the data availability, access performance and the cost of development and maintenance is essential for designing remote mirroring systems.

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