也称为主题词，是经过规范化处理的，以基本概念为基础的表达信息内容的词和词组。也叫受控词。
叙词表中的每个词汇都称为叙词，每个叙词都表达一定的概念。
Each word in the thesaurus is called a descriptor; each descriptor expresses a certain concept.
信息可视化技术用于叙词表的过程就是叙词表词间关系可视化。
The visualization of Relationships between Descriptors is the process of the information visualization technology applied to the thesaurus.
这对我国八五期间该领域内研究课题的开展有一定指导作用。叙词：故障诊断，?。
It was of guiding signifcance for developing this objects during the eighth-five year program.
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