问题：哪个数据传输对象由哪个实体返回？
The problem: which data transfer object is returned by which entity?
此问题的征兆就是：一个作为参数发送或作为响应返回的复杂数据对象丢失了某些元素。
The symptom of this problem is that a complex data object that is sent as a parameter or returned as a response may be missing certain elements.
更为重要的问题是计算如何确切地返回到与数据状态相符的流逻辑的相关部分。
The far more important problem is figuring out how to get back to exactly the relevant part of the flow logic that corresponds to the data states.
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