| environ. | indexing of documentation A service which creates a special contents list, containing titles, authors, abstracts, subject headings and other information, to describe a large number of publications and to be used in searchable, machine-readable (or printed) look-up tables | 建立文档索引 (提供一种在可搜索，机读(或打印)的平台中对公共出版物按照特殊的目录列表进行查寻的服务。这些特殊的目录列表包括标题，作者，摘要，主题及其它方面的信息。) |