UI, the user interface (or Human Machine Interface) is the aggregate of means by which people—the users—interact with the system—a particular machine, device, computer program or other complex tools.

ID3 is a metadata container most often used in conjunction with the MP3 audio file format. (via wiki)

其实，如果各位不懂上面几个名词的话，那么OPPO D29H还是不错的选择，至少它有彩屏，而Apple iPod Shuffle没屏幕，Sumsung YP-E3Z是四色屏，此外它还可以看图片(.jpg和.bmp),可以看电子书(.txt)，可以看视频(.avi)，甚至还可以听无损压缩的音乐(.ape和.flac)……嗯，有点还是不少的，或许以后我会慢慢喜欢上它，至少现在无聊的时候我可以拿它重温Heroes。