Such a taxonomy is expected to be particularly useful here, due to the large number of items and the sparseness of data per item (mostly attributed to "tracks" rather than to "artists").
这样的分类是非常有用的，因为条目巨多并且每条数据不全（因为有 "track" 属性而没有 "artists" 属性）。
He says two before the item data per day renew.
他说前两项数据每天都在更新。
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