服务包括任何可供对方使用的功能，并不只局限于语音、视频和文件传输等。

Service is not only limited to voice, video or file transfer, but also comprises all kinds of functionalities that can be used by other network elements.

youdao

其中一个软件可以在不联网的情况下与其他设备即时分享照片、视频和文件夹。

One app, for example, lets users instantly share photos, videos, music and document files with other devices, without requiring an Internet connection.

youdao

Skype公司发布了一款软件，能够使用户通过网络进行视频和音频电话、即时聊天和文件传输。在软件首发后的六周内，就有150万用户下载了该软件。

Within the first six weeks of its initial release, 1.5 million users had downloaded the software, which allows video and voice calls, instant messages and file transfers to be made over the Internet.

youdao

And as we'll see mid semester, photographs and videos and other more sophisticated file formats.

在我们学期中的时候会看到，图片和视频以及,更复杂的文件格式。

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