The more data, the more mapping information and Pointers required for memory translation and the maintenance of them.
数据越多，内存转换和数据维护所需的映射信息和指针也越多。
This also frees you from low-level data conversion and mapping tasks, and enables you to focus more on business logic development.
而且您再也不用执行低级数据转换和映射任务，使您能够更多地关注业务逻辑开发。
The external mapping file enables developers to customize the data mapping and thereby gaining more control over the way mapping can be derived.
外部映射文件使开发人员能够定制数据映射，从而获得对映射派生方式的更多控制。
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