Our construction of VRD is based on the network services of Fudan University Library (FDL), such as FAQs, Readers' Message Board, BBS and so on.

复旦大学图书馆利用网络为读者提供常见问题回答、读者留言板、BBS等多种咨询服务，为虚拟参考咨询系统建设提供有关的研究和服务基础。

Analyzes the factors influencing the network reference service system and discusses the functions of the system taking the software VRD as an example.

剖析影响网上参考服务系统的因素，并以网上参考服务软件VRD为例，对网上参考服务系统的功能进行探讨。

By this method, we found that the VRD indices for most watersheds of the northwestern basin were less than -0.2, displaying a severe vegetation deficiency.

通过该评价方法发现，在泾河流域西北部的大部分子流域的植被冗亏指数小于-0.2，植被亏缺较为严重；

The paper introduces the information of papers presented at the annual VRD Conference 2003 and reveals the current status of the study of virtual reference services abroad.

文章介绍了在2003年VRD年会上宣读的论文信息，展示了当前国外虚拟参考服务领域的研究状况。

The second, the paper have probed into the concept, form, main function and operating mechanism of virtual reference service system, and has introduced VRD and CDRS project in detail.

其次，论文探讨了虚拟参考咨询系统的概念、形式、主要功能、运行机制，并详细介绍了VRD和CDRS项目。