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There are different types of storage; databases, file systems, in-memory data, persistence devices like native directories are but a few examples.
存储的类型有很多种；数据库、文件系统、内存数据和诸如原生目录等持久化设备都是存储。
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Types of persistence context: Transaction or extended.
持久化上下文的类型：事务性或扩展型。
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