这有点多余，因为每条曲目都已经有了带有其曲目编号的特性。
This is a bit redundant because each track already has a property with its track number.
Track：包括曲目标题、创作者以及曲目在专辑中的编号等特性。
Track: includes properties for track title, the creator, and the track number in the album.
Track：包括曲目标题、创作者以及曲目在专辑中的编号等特性。
Track: includes properties for track title, the creator, and the track number in the album.
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