名词
中文翻译：自由索引
同义词：
['free indexing', 'free indexing system', 'free indexing method']
例句：
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1. The company's new software offers a free indexing service for its users.
该公司的新软件为其用户提供免费的索引服务。
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2. The research team developed a free indexing tool to help researchers find relevant information more quickly.
研究团队开发了一款免费索引工具，帮助研究人员更快地找到相关信息。
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3. In the digital age, free indexing is becoming increasingly important as it allows users to easily search and retrieve information without paying for expensive databases.
在数字化时代，免费索引变得越来越重要，因为它允许用户轻松搜索和检索信息，而无需支付昂贵的数据库费用。