关键词是由一个或几个单词构成,用来表示某一概念的词,关键词是在叙词标引的基础上来选定的。我们在科技期刊中常用的关键词,它可以是叙词(主题词),也可以是自由词,叙词标引应遵守相关标准的规定。标引规则简述如下。◆从叙词表(主题词表)中查找切合主题的专指叙词或组代叙词标引,应尽量用《汉语主题词表》等词表中提供 Keyword is composed of one or several words, used to represent a concept of the word, the keyword is based on the index of the selected index. We are commonly used in scientific and technical journals periodicals, which can be thesaurus (subject), it can be a free word, thesaurus indexing should comply with the relevant provisions of the standard. The rules of indexing are summarized as follows. ◆ Search the thesaurus (the thesaurus) to match the subject specific descriptor or the group on behalf of thesaurus index should be used as “Chinese thesaurus” and other vocabulary