The problem: which data transfer object is returned by which entity?

问题：哪个数据传输对象由哪个实体返回？

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As one of the core patterns of J2EE, data transfer object pattern is presented to solve the problem.

作为J2EE核心设计模式之一的数据传输对象模式的提出，就是为了解决该问题的。

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There are three important ways in which SDOs add to the basic Data Transfer Object pattern.

SDO在以下三个重要的方面增强了基本数据传输对象模式。

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