在网格视图，stack现在有一个最大尺寸并可以滚动；在播放一个stack时可以选择一个文件夹并导航到那个文件夹，而不是开启一个新的Finder窗口。
In grid view, Stacks now have a maximum size and can be scrolled; and choosing a folder while displaying a stack navigates to that folder in-place, rather than launching a new Finder window.
播放模式：列表循环，单曲循环，随机播放，单首，文件夹播放。
Play mode: List cycle, single cycle, random play, single head, folder playback.
这些歌曲，专辑和播放列表有没有一个特定的文件夹结构。
The songs, albums and playlists don't have to have a specific folder structure.
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