1. A tree or shrub grown by this method. 
   盆景用这种方式培植出的树或灌木
2. hierarchical theory of needs 
   需要层次论
3. hierarchical type of organization 
   层级制
4. A method of transforming a search key into an address for the purpose of storing and retrieving items or data. The method is often designed to minimize the search time. 
   为存储和检索数据项或数据，把搜索关键字转换为一个地址的一种方法。该方法常用于减少搜索时间。
5. optimization methods for hierarchical control 
   递阶控制最优化方法

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