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BNC: 23187 COCA: 21095
obsolescence
noun [U] /ˌɒbsəˈles(ə)ns/
  1. the state of becoming old-fashioned and no longer used, especially because of being replaced by something newer and more effective 废弃;淘汰;过时
     Synonyms and related words
    Old-fashioned: old-fashioned, primitive, obsolete...
BNC: 23187 COCA: 21095
BNC: 23187 COCA: 21095

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