叙述了数字地球的由来、概念和作用。
The origin, conception and function of digital earth is narrated.
介绍了在电力市场环境下辅助服务的基本概念和作用。
The basic concept and functions of ancillary services are introduced in this paper.
随后介绍了本体的概念和作用，并详细论述了本体在信息过滤中的应用。
Then, it introduces the concept and function of Ontology, and discusses the application of Ontology in information filtering in detail.
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