《揅经室外集》是目录学史上一部重要的著作，文章由分析《外集》的成书，论述了阮元在《外集》中所起的主导作用；
I point out the leading role played by Ruan Yuan in the edition and systematically analyze the abstract style inherited from SiKuQuanShu and the reason why it is better than that of SiKuQuanShu.
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