hierarchical classification短语¹⁴⁴⁹⁷²⁺² 基本例句 层次分类,谱系分类 To help view the product cost incurred by different level, a product family structure is represented by a hierarchical classification of product cost. 为了检视每个阶层所引发的成本，我们以产品族的方式来呈现整个产品阶层式的成本结构。140.118.33.11