The company announced that for $20 a year, users will receive unlimited storage space for their MP3 and AAC music files.

亚马逊宣布，用户只需每年交付20美金，就可拥有无限储存空间来储存MP3和AAC件。

They are also able to download MP3 music files from the Internet.

他们还可以从 Internet 下载 MP3 件。

You've no doubt encountered many types, like text files, music files, photos and videos.

毫无疑问，遇到过多种类型，本件、件、照片和视频。

A music file or podcast's data isn't an analog waveform like this, but rather it's just a long set of points equally spaced apart with their associated values.

件或播客的数据不是像这样的模拟波形，而只是一长串等距分布的点及其相关值。

" To upload" means to put a file, like a picture or a music file, onto another computer called a " server, " and that server is connected to the Internet so that other people can look at or download that file.

“上传”是指将件（图片或件）放到另一台称为“服务器”的计算机上，并且该服务器连接到 Internet，以便其他人可以查看或下载该件。