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.

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。

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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.

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。

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