分类浏览：Web站点上的一部分文档或所有文档根据分类法分类显示，每个文档都归属于分类法中的一个或多个节点，用户可以通过分类目录浏览文档。
Taxonomy browsing: Some or all of the documents on a Web site are displayed as a taxonomy that can be navigated, with each document assigned to one or more nodes of the taxonomy.
通过分析现有色素的研究内容和分类法，提出了后色素的定义和分类，并分析了几种典型的后色素物质。
A definition and classification of after-pigment was put forward which is based on the investigation and analysis of pigments. Meanwhile, some typical after-pigments were analysed.
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