An example of an optional service is the policy service because not all repositories can (or need to) express their administration policies in a general way.

可选服务以策略服务为例，因为一般来说不是所有的知识库能够(或者需要)展示其管理策略。

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This is part of the US Gov. General Service Administration " Excellence in Design" program that seeks to incorporate contemporary art on new Federal projects.

属于美国总务管理局《卓越设计》企划分支中当代艺术的一部分。

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