很可能，你已经拥有了一台MP3播放器，并连接上了互联网。
In all likelihood, you already own an MP3 player and have Internet access.
便携设备：允许应用程序枚举诸如音乐播放器、数码相机等连接设备上的内容。
Portable devices: Allow applications to enumerate content on connected devices like music players, digital cameras etc.
这样你就可以使用iPod CD播放器或者其他可以直接连接的音频源了。
That's so you can connect an iPod, CD player or some other directly connected audio source.
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