In search engine technology it describes how a Web page exists in two forms: one page is delivered to the user, while the other page is often deliberately developed so that it is placed at the top of a search engine ranking.
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。