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说明：  文件中包含了歌曲名,专集名,歌手名,发行日期等信息 一个合格的播放器是可以将其提 取出来予以显示的 这些信息存在偶们称之为ID(The file contains information about the name of the song, the name of the collection, the name of the singer, the date of release, and so on. A qualified player is able to pull it up and display this information that we call ID.)