Thus a powerful reading guidance system must be set up as far as the colossal and complicated document information center is concerned, so that it can aid patrons in retrieving and using documents.

• 对于这样一个庞大的、复杂的文献信息系统来说,必须建立一个有效的导读系统来帮助图书馆知识受众查找、利用文献。