文章
Google China Search Comparison
Web users in China have been able to access English and Chinese-language search services at Google.com for several years... Google did not censor its own search results... On January 25 2006, Google launched Google.cn, a self-censored Chinese-language search service... The filtering takes place in at least three ways... To help understand how the results of Google.com and Google.cn differ, the OpenNet Initiative has assembled a tool that lets you simultaneously compare search results. [also refers to Microsoft, Yahoo]