hierarchical structure of directory

例句：

1. 1. The organization of the data is hierarchical, with each level having its own set of rules.
   数据的组织是分层的，每个层级都有自己的一套规则。
2. 2. The company's structure is hierarchical, with executives at the top and employees at the bottom.
   公司的结构是分层的，高层有执行官，基层有员工。
3. 3. The hierarchical nature of the system means that it can be difficult to navigate without prior knowledge.
   系统的分层性质意味着如果没有预先知识，导航起来会很困难。