这类方法延续到了20世纪，只不过已经演变为图书馆馆员在书目资料输入计算机系统里之前用来记录书名、著者、主题等等项目的目录卡。

The idea survived into the 20th century in the shape of the little catalogue cards librarians used to note down a book’s title, author, subject and so on before the records were moved onto computers.

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图书馆计算机管理进入网络化阶段后，计算机系统的各类资源容易受到非法用户的破坏，而采取分网运行机制管理网络，能增强网络的安全性。

In the network stage, all kinds of resources in the library computer manage system will be damaged easily by illegal user. Using a separated network system can buildup security of the network.

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