从版本控制删除档案和资料夹。
暂存档案的内容会清除，但不会删除档案。
The contents of the temporary files are erased but the files are not deleted.
大部分书目将在两星期内过期，且有时会员必须删除档案，这样下一个在虚拟队伍中等待的顾客才能取得阅读许可。
Most titles expire after two weeks, though in some cases members are asked to delete the file, so the license can be transferred to the next patron waiting in a virtual line.
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