Because changes aren't reflected across the content delivery networks immediately, ghost copies of files tend to linger for days or weeks.

由于更改不会立即在内容交付网络中反映出来，文件的影子副本往往会持续几天或几周。

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While your personal computer only keeps one copy of a file, large-scale services like Facebook rely on what are called content delivery networks to manage data and distribution.

虽然你的个人电脑只能保存一个文件的一个副本，但像 Facebook 这样的大型服务项目，则会依赖于所谓的内容分发网络来管理数据和分发。

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Content delivery on the Internet now takes a new form.

现在，互联网上的内容交付有了新的形式。

youdao

Video on-demand has to do with the delivery what they call content, while the video phone is the deliver of person-to-person communication. These are not nearly the same, but they both involve video.

随需视频必须与传送他们所称的“内容“相关,而视频电话是一种,个人对个人的传送，那不是,大致相同的，但它们都包含视频。

麻省理工公开课 - 媒体、教育、市场课程节选

The company is cutting prices for its cloud bandwidth and content delivery network services by 33%.

FORBES: Rackspace Shares Slide As Company Sharply Cuts Prices

And Akamai, the largest Content Delivery Network (CDN), discovered that they were in the business too.

FORBES: DDoS: coming to a network near you

Today many video companies pay content delivery networks such as Akamai for video delivery.

FORBES: Backed By $24M, Qwilt Builds Next Generation Video Infrastructure