The process of replacing a broad, descriptive word in a search query by one which is more specific. This enables the user of a search engine or some other retrieval technology to home in on a particular set of results.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。