With the explosive growth of Internet information, people become more and more dependable on the Internet search engine, which become the key to open up the knowledge palace and the tool to acquire the knowledge. 互联网的信息量呈爆炸趋势增长,增强了人们对搜索技术的依赖性。搜索引擎是开启网络知识殿堂的钥匙,获取知识信息的工具。