系统编目描述数据的逻辑和物理结构。
The system catalog describes the logical and physical structure of the data.
这也许和物理的数据结构不同，但不重要。
This may not be the same as the physical data structure, but that is unimportant.
数据中心(物理系统与网络连接)的结构。
Architecture of the data center (physical systems and network connections).
用逻辑结构或物理结构来描述数据是有很大不同。
It is different to describe the data in logical or physical.
索引是包含指向数据的指针的物理结构。
An index is a physical structure containing Pointers to the data.
同时，给出了产品的部分物理常数和结构分析的有关数据。
The physical contents and the structure data of the product are given as well.
同时，给出了产品的部分物理常数和结构分析的有关数据。
The physical contents and the structure data of the product are given as well.
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