The focus so far has been on mapping the model's structure and properties into the view.
到目前为止，侧重点都是将模型的结构和特性映射到视图。
By constructing the BOM structure model, mathematic expression and arithmetic of the four types of Items in the multi-view mapping course is deducted.
通过建立BOM结构数学模型，推导了四种类型物料项映射规则的数学表达式和相应的算法。
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