目前没有一个网页搜索引擎可以覆盖超过60%的互联网上全部网页，而大部分的网页数据库更新周期都在一个月左右。

Now no web search engine can cover more than 60 percent of all the pages on Internet. The update interval of most pages database is almost one month.

youdao

目前没有一个网页搜索引擎可以覆盖超过60%的互联网上全部网页，而大部分的网页数据库更新周期都在一个月左右。

Now no web search engine can cover more than 60 percent of all the pages on Internet. The update interval of most pages database is almost one month.

youdao