中文说明：用结点表示属性，用有向边表示属性之间的依赖关系，把类别属性作为根结点，其余所有属性都作为它的子节点。通常，用虚线代表NB所需的边，用实线代表新增的边。属性Ai与Aj之间的边意味着属性Ai对类别变量C的影响还取决于属性Aj的取值。
English Description：
The attributes are represented by nodes, and the dependencies between attributes are represented by directed edges. The class attribute is regarded as the root node, and all other attributes are regarded as its child nodes. In general, dotted lines are used to represent the edges needed by Nb, and solid lines are used to represent the new edges. The edge between attribute AI and AJ means that the influence of attribute AI on category variable C also depends on the value of attribute AJ.