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1. The search engine uses a keyword index to rank websites based on their relevance to specific keywords.
搜索引擎使用关键词索引来根据与特定关键词的相关性对网站进行排名。
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2. In the field of information retrieval, keyword indexing is a technique used to organize and retrieve data based on specific keywords.
在信息检索领域，关键词索引是一种用于基于特定关键词组织和检索数据的技术。
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3. The keyword index system helps users quickly find relevant information by providing a list of keywordsthat are most commonly searched for.
关键词索引系统通过提供最常用的关键词列表，帮助用户快速找到相关信息。