As you can see from above, it is certainly possible to have a good collaborative filtering system without a recommendation engine (as seen in Flickr).
正如你从上述中所看到的，如果没有一个推荐引擎(如看到的Flickr)这当然也有可能是一个良好的协同过滤系统。
On websites, it’s seen as inevitable, and a site without ads is almost unheard of (very different from the web of 15 years ago, when ads were rare).
网站上看起来不可避免地会有广告，没有广告的网站连听都没听说过（这不像15年前的网站，那时候广告很少）。
Also known as "h and chi Persei", this unusual double cluster, shown above, is bright enough to be seen from a dark location without even binoculars.
上图所示的这一亦称“h和chi英仙座”(“ h andchi Persei ”)的不同寻常的双星星群的亮度高到可以在一个暗处不用双筒望远镜就看到。
Also known as "h and chi Persei", this unusual double cluster, shown above, is bright enough to be seen from a dark location without even binoculars.
上图所示的这一亦称“h和chi英仙座”(“ h andchi Persei ”)的不同寻常的双星星群的亮度高到可以在一个暗处不用双筒望远镜就看到。
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