Information retrieval is to establish various retrieval systems by collecting, processing, organizing and storing a large number of scattered and disordered literature information, and to achieve this by using certain methods and means of the two processes of storage and retrieval (feature mark refers to a set of special symbols or codes selected from natural languages and standardized) Consistent, so as to effectively obtain and utilize information sources. Storage is for retrieval, and retrieval must be stored first.<br>
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