因而，它与代码自动地保持同步，而不需要任何“代码- UML生成”的双向工程。
As such, it is automatically kept in sync with the code and does not require any round-trip code to UML generation.
本段讨论了在执行双向工程时对大型uml模型使用模型片段时的益处。
This section discusses the benefits of using model fragment for a large UML model when performing round-trip engineering.
如果没有对已有源代码的可视化或者获取模型的—并且没有对之前被识别的代码进行合并，就不会有双向工程的概念。
There is no visualization or harvesting of models from existing source code — and without a merge as identified previously, there is certainly no notion of round-trip engineering.
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