SPOT是 /user文件系统的NIM层次结构。
物理抽象层次捕获系统实现的结构。
The physical level of abstraction captures the structure of the system implementation.
提出了一种采用树形层次结构的分布式网络安全系统管理模型。
A management model of distributed network security system with tree-like hierarchical structure was introduced.
这种设计模式使系统结构层次清晰，各部分模块划分明确。
This pattern makes the structure clear and every division has its definite function.
这种设计模式使系统结构层次清晰，各部分模块划分明确。
This pattern makes the structure clear and every division has its definite function.
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