求翻译：类图的重要性不仅仅体现在为系统建立可视化的、文档化的结构模型，同样重要的是构建通过正向和反向工程建立执行系统，以致没有类是单独存在的，类通常和别的类协作，来创造比单独工作更大的语义。是什么意思？

The importance of the class diagram for the system is not only reflected in the establishment of a visual document of the structural model , equally important is to build a system set up by the implementation of a forward and reverse engineering , so that no class is alone , classes generally , and

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The kind of chart importance manifests not merely in for the system establishment visualization, the documents structural model, constructs similarly more importantly through forward and the reverse engineering establishment execution system, so that does not have the kind is alone exists, kind usua

Importance not only in the class diagram for the system establishment of visualization and structure model of the document, it is also important to build through the forward and reverse engineering system, that no class is a single, usually with other types of cooperation to create more semantic tha

正在翻译，请等待...