精华 便携式媒体播放器MP4全面释疑(组图)

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I don't see why they "INVENT" this so-called MP4--well, I can get an IPOD and A GBA-SP to watch video and listen 2 music using the money--so why bother?JUst cuz we've already got Mp3,so we have 2 invent sth. called MP4???Get a PSP or NDS,my friend...