它的绝大多数概念都链接到外部的网络知识资源，以及相关的概念上。

Most of its concepts have links to various external online knowledge resources, as well as to related concepts.

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到外部或者非html资源的链接保留不动。

Links to external or non-HTML resources remain unchanged.

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PDB中心提供了一个元数据服务，来生成详细的RDF，联系两两LSID之间以及提供到外部资源的链接。

The PDB authority also offers a metadata service that generates comprehensive RDF that relates LSIDs to each other and provides links to external resources.

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