The paper, based on the model of "block of time" cost calculator, makes a simple model to accommodate for the library practice of virtual reference services in our country.

在介绍“间隔时间”成本预算模型的基础上，对该模型进行简化，使其适合中国图书馆界虚拟参考咨询服务的实践。

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Web-based real-time reference service is the hot spot of library research and experiment abroad.

网上实时参考服务是当今国外图书馆研究与试验的一个热点。

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"It remains a library, for the first time a reference library available to everyone, " said Ms Taverne.

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