互联网的日益普及和不断发展在构建世界上资源最丰富的信息库、促成资源共享的同时,也使信息不断膨胀,边际效用减少,搜寻成本增加,甚至成为一种紧张的负荷。搜索引擎的诞生很大程度上缓解了这种紧张。它利用关键词技术,极大便利人们的信 The increasing popularity and continuous development of the Internet In the construction of the world's most resource-rich information database, contributing to resource sharing, but also to keep the information expanding, reducing the marginal utility, search costs increase, or even become a burden. The birth of search engines to a large extent alleviated this tension. It uses keyword technology to greatly facilitate people's beliefs