左侧引擎 YaCy YaCy (local) startpage.com bing.com metager.de metager2.de (web) metager2.de (international) Wikipedia English Wikipedia Deutsch wolfram alpha OAIster@OCLC   右侧引擎 YaCy YaCy (local) startpage.com bing.com metager.de metager2.de (web) metager2.de (international) Wikipedia English Wikipedia Deutsch wolfram alpha OAIster@OCLC