Another reason behind this could be to free up the bandwidth by blocking unnecessary traffic coming from sources like advertisement sites.

另一个背后的原因是，通过阻塞来自类似广告站点之类的源的多余流量，可以节省带宽。

youdao

It was essentially an advertisement for recorded music, supplied free by a record company to a channel-mtv-for which viewers paid, and which also showed actual advertisements.

其本质上，只是针对唱片音乐的一种广告，由唱片公司免费供给MTV频道，观众付费收看，而该频道同样播出实际广告。

youdao

We7 is offering all kinds of free tunes - if you're ok with a brief advertisement being appended to the track.

we7提供各种免费歌曲，只要你乐意他们在一首曲目上附加一个简短的广告。

youdao

Sirius on the other hand uses a subscription model that offers advertisement-free satellite radio services and exclusive content.

FORBES: Sirius Is Not Why Pandora's Stock Is Falling

Internet ABC Project promotes the use of technologies by children and adults through advertisement-free content of more than one million pages.

UNESCO: MEDIA SERVICES

Completely advertisement-free, and requiring no registration or subscription, Nokia Music lets consumers immerse themselves in the dulcet tones of their favorite artists without being disrupted.

ENGADGET: Nokia Music free streaming service comes to US, available exclusively for Lumia handsets