水电机组运行可靠性整体水平低于1999年，水电机组等效可用系数为90.30%。

While the operational reliability of hydropower units was lower than 1999, with an equivalent availability of 90.30%.

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集群关系数据库以获得可伸缩性和可用性是一种业已建立的良好规程，因此我们不再花费时间讨论集群关系数据库的技术。

Clustering of relational databases for scalability and availability is a well established discipline, and so we will not spend time discussing techniques for clustering relational databases.

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活动记录模式则可用来在域类内包装关系数据库持久性方法。

You use the active record pattern to wrap relational database persistence methods in domain classes.

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