所有程序员都有必须解决数据持久性问题的经历。
All programmers have had to solve the problem of data persistence.
它使程序员不必知道各种不同数据的底层格式或位置。
It shields programmers from knowing the underlying formats or locations of their disparate data.
使程序员均衡数据导入和导出机制的工具是很有用的。
Tools that let programmers leverage standard data export and import mechanisms are very useful.
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