什么是数据持久性？
The Persistent classes aim to make data persistence easy.
persistent类旨在使数据持久性变得简单。
All programmers have had to solve the problem of data persistence.
所有程序员都有必须解决数据持久性问题的经历。
It is very significant to research data persistence strategy.
因此，研究数据持久性策略具有重要意义。
It is very significant to research data persistence strategy.
因此，研究数据持久性策略具有重要意义。
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