Through the example of Tongji Information Retrieval Network System (TJIRNS), the paper mainly describes on-line expansion function and its implementation under the specific conditions.
文中以同济情报检索网络系统（TJIRNS）为例，论述了典型环境中联机扩展功能及其实现过程。
The characters of its information resources, retrieval methods and results are fully introduced and the function is briefly commented on this paper.
本文详尽地介绍了它的信息资源、检索方法及结果显示等特点，并对其功能作了简要评述。
The paper introduces the significance, function and key technology of the information retrieval intellectualized service and teaching system of Southwest Jiaotong University.
介绍了西南交通大学信息检索智能服务与教学系统的意义、功能和关键技术。
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