These diagrams drive the persistent data.
这些关系图驱动持久性数据。
How long that persistent data remains around?
持久性数据大约保留多久。
The speed and size of the persistent data store.
持久性数据存储的速度和大小。
Exactly how persistent data is queried by a client can vary.
确切地说，客户查询持久性数据的方式可以所有不同。
In the sample application, the file system is used as the persistent data store.
在样例应用程序中，文件系统用作持久性数据存储。
And you need a database to store persistent game data.
还需要用一个数据库存储持久性游戏数据。
Normally, this important data must be persistent, like bank account records.
通常，重要的数据必须具有持久性，比如银行账户记录。
Data — Components that provide access to persistent and other external data.
数据——提供对持久性数据和其他外部数据的访问的组件。
The Persistent classes aim to make data persistence easy.
persistent类旨在使数据持久性变得简单。
A message engine has its own data source, which is USES to store persistent messages.
消息引擎有自己的数据源，它用来存储永久性消息。
A message engine has its own data source, which is USES to store persistent messages.
消息引擎有自己的数据源，它用来存储永久性消息。
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