Information reference service is an important Libray reader service.
信息参考服务是图书馆读者服务的一项重要内容。
The first part is about UML technology as a reference for the reader, and then the author gives the key questions in the design of Internet-Game Frame: game platform and service layer.
提出了网络游戏框架设计技术中需要解决的关键问题：游戏平台实现和服务层实现。
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