《国外林产工业文摘》1999年年度索引包括主题索引和分类索引。现就该索引的有关问题做如下说明。本年度主题索引的款目结构由导词+说明词+顺序号构成。导词是进行文献检索的入口词;说明词对导词起限定、修饰和补充的作用。两者组合即可较直观、完整、简明、扼要地表达文献内容。主题索引中 The “Forestry Industry Digest of Foreign Countries” 1999 annual index includes subject index and category index. The following is a description of the relevant issues of the index. The entry structure of the theme index for this year consists of a preposition + explanatory word + sequence number. The prepositional word is the entry word for document retrieval; the explanation word plays a role in defining, modifying, and supplementing the guide word. The combination of the two can be more intuitive, complete, concise and concise expression of the content of the document. Topic Index