MP3 is very popular. Nowadays, computers should have MP3 players or players with upgraded MP3 playback plug-ins. However, special circumstances cannot be ruled out.

As courseware for class, if possible, it should be tested in the classroom, including whether the PPT runs smoothly and whether there are any other problems. Otherwise, if something goes wrong during practical application, you will be in a hurry, thus affecting the effectiveness of the class.