The site is called Knol, which stands for a unit of knowledge, the company said on its blog.Google invited a selected group of users to start testing the site this week.

• 谷歌，一个拥有最流行的英特网搜索引擎的公司，发起了一个将与维基百科（网上百科全书）相竞争的由用户撰写并编辑词条的网站。