The problem, though, is that most people picture immediately a very simple hierarchical structure with well-defined levels, such as the master-subordinate relationship.
尽管如此，问题是大多数人会立即绘制出拥有定义明确的层次的简单层次结构，例如主次关系。
The division of city hierarchical structure is a multi-index classification problem.
城市规模等级结构的划分是一个多指标的分类问题。
Bilevel programming is a kind of two-story structure of the hierarchical decision-making optimization problem.
二层规划是一种具有二层递阶结构的决策优化问题。
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