闭合原则 连续原则 连接原则：物理上连接的为同一群体
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'Filk' is the folk music of the science fiction and fantasy community - you get parodies, you get traditional music that's had the words slightly modified, and you'll also get just original works that have been written about science fiction and fantasy works, or with science fiction and fantasy themes.
With the growth of Harvard from a small provincial college into a great University, a unique paranoia has swept the ranks of local officialdom, furrowing brows throughout University Hall. The lurking fear is that somehow, in the operations of the gigantic administrative machine, a student might get lost in the shuffle.