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对国内外关于文献老化的共时与历时观察研究进行了评述，并对存在的问题加以分析和探讨，认为两种观察从不同侧面反映了文献老化的真实性，共时观察具有普遍性，反映了文献老化的即时状态，历时观察具有针对性，反映文献老化的过程
Summarized the research on synchronic and diachronic observations about the aging of the literature at home and abroad, and analyzed and discussed the existing problems. They considered that the two kinds of observations reflected the authenticity of the aging of the literature from different aspects. The observation of synchronic observation is universal and reflects The literature of the real-time status of the aging, lasted for a targeted observation, reflecting the process of aging literature