Try to model a simple Library system that has a number of shelves, and each shelf has a number of books that are arranged in a sorted order based on their title.

试着建立一个拥有一定数量书架的简单图书馆系统的模型，每一个书架拥有一些按其名字排序的书籍。

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A structural element can be a subsystem, a process, a library, a database, a computational node, a legacy system, an off-the-shelf product, and so on.

一个结构组件可能是一个子系统，进程，库，数据库，计算结点，馈赠系统，按需产品等等。

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The library has a moving shelf system to increase the space utilization.

图书馆移动书架系统可增大利用空间。

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