任何给定产品都可以划分到层次结构内的或跨许多层次结构的多个类别中。
Any given product can be placed into many categories within and across many hierarchies.
UNIX的传统是在目录结构的许多层次上具有兄弟目录，lib和bin。
UNIX has a tradition of having sibling directories, lib and bin, at many levels throughout the directory structure.
本质作为事物内在的规定性，具有一般性、抽象性、相对的稳定性及结构上的多层次性。
Essence as an integrated part of substance possesses the characteristics of being general, abstract, relatively stable and multi-layer in structure.
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