本文分析了自由词标引系统的优缺点。
The article analyzes the merits and demerits for the system of free term indexing.
自由词标引是对以《中国分类主题词表》为依据的主题标引的补充。
Free term indexing is a supplement for subject indexing of Chinese Classified Thesaurus.
一篇文献必须先用正式主题词作较泛指的组配标引、上位词标引、靠词标引，再用自由词作较专指的标引，即作双重标引。
A document should be indexed more generally first by descriptors, such as coordinate indexing, hypernym indexing and proximate indexing; then by free term specially, namely double indexings.
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