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文章概括叙述了套录与汇录技术在联机检索中的应用的技术背景，着重介绍了套录的软件和其性能，以及套录的具体应用情况。
The article summarizes the technical background of the application of encodings and recording technology in online retrieval, and emphatically introduces the software of encodings and its performance, as well as the application of encodings.