The issn key title and number are vocabularies controlled by the issn international centre Issn识别题名和号码是由issn国际中心（ issn international centre ）控制的词汇表。
2.
Based on discussing the necessity of vocabulary control , this paper mainly analyzes the measures , characteristics and presents new techniques of vocabulary control in natural language retrieval 摘要本文综述了自然语言检索中词汇控制的必要性、措施，在此基础上分析了自然语言检索的特点及发展的新趋势。
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