我们在包含计算器状态的底层数据库中包括和维护使用的标准（创建时间、最近访问时间，等等）。
We include and maintain usage metrics (creation time, last access time, etc.) in the underlying database containing the calculator state.
样本应用程序使用CMP实体Bean(它使用关系数据库作为底层持久化机制)来维护计算器状态。
The sample application maintains the calculator state using a CMP entity bean that makes use of a relational database as the underlying persistence mechanism.
精确定位的网站，在线计算器，数据库和网络社区，这将帮助你做出各种有益的决定。
Pinpoints a variety of Web sites, online calculators, databases, and online communities that will help you make beneficial decisions.
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