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人类社会的发展积累了浩如烟海的各类文献。随着岁月的流逝,一些久远的资料已然湮没,不再为人所知,这些资料中蕴含的价值也随之无法再被利用。为了将各个年代有价值的文献有效地利用起来,人们编制了各种检索工具。这些检索工具实际上具有存储和检索两方面的功能。存储是使文献由分散到集中,由无组织到系统化的过程;检索则是使人们按照一定的检索方法,随时从中挑选出所需的文献。
The development of human society has accumulated a vast variety of literature. As time goes by, some long-standing information is lost and no longer known, and the values contained in these materials can no longer be used. In order to make effective use of the valuable literature of all ages, a variety of search tools have been developed. These search tools actually have both storage and retrieval capabilities. Storage is to make the document from decentralized to centralized, from the organization to the process of systematization; retrieval is to enable people in accordance with certain retrieval methods, at any time from the selection of the required documents.