Business entities are the fundamental building block of the conceptual data model.

业务实体是概念数据模型的基本构建块。

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By adding an XML data model to the XFDL form, you can collect required data and place it in a separate block of XML in the form.

通过给XFDL表单添加XML数据模型，可以收集必需的数据并将数据放在单独的xml块中。

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From a simple block model to a bridge support system, the QuaDror system shows its abilities at all scales.

从一个简单的块状模型到一个桥梁支撑系统，QuaDror系统显示了其广泛的适用性。

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