About MP3 and MP4 ~ ~ ~ ~

Users questions: Now, in what it does better? ? ? I used a little demand. Demand mainly used: 1, can be used to listen to English. 2, listen to music. 3, can watch movies, to be clear points. 4, there are subtitles. Will buy MP3 or MP4 it good? ? What brand of practical to be done? Prices in the 300 - 500 between. . .
Experts answer: a student? I think better to buy MP3. Because in general the MP4 not clear, even if the definition can be, looks very uncomfortable. If you want to see the movie, or a good computer. I am a student, according to the experience of students, to buy MP 4, no use, but also waste electricity.
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