从理论上将，它可提供三种服务：主体数据库维护、身份验证服务器(AS)和票据授予服务器(TGS)。
Logically it provides three services, principals database maintenance, authentication server (as), and ticket granting server (TGS). KDC runs two important daemons.
提出了基于自由配色、基于色彩调和理论和基于概念色彩方案库的三种自顶向下色彩设计模式。
Three Top-Down color design mode were proposed. They are each based on freely matching colors, color harmony theory and concept color scheme database.
作为第三代数据库的OODB，要求是新的理论方法和技术。
OODB, as the third generation database management system, is required new theories, methods and techniques.
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