The authors propose a kind of CD ROM database information services based on virtual networks and shared by telephone, fax and the Internet.
它可使光盘数据库充分发挥效能，使信息服务机构获取最大收益，还可避开基于广域网的光盘数据库信息服务中引起的版权之争。
The third edition is an electronic edition published previously as a CD Rom and now available as an electronic database.
第三个版本是电子版，之前以只读光盘出版，现在，在电子数据库也有。
Though challenged over the last decade by the CD-ROM, eBook, and searchable online database, books remain the most popular way to acquire knowledge.
在过去的几十年内，它尽管受到来自光盘、电子书、可在线搜索的数据库的挑战，却仍然是获取知识的最受欢迎的方式。
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