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Oligocene 音标拼音: ['ɑləgos,in] n. 渐新世,渐新统
a. 渐新世的,渐新统的 渐新世,渐新统渐新世的,渐新统的 Oligocene n 1: from 40 million to 25 million years ago; appearance of sabertoothed cats [synonym: {Oligocene}, {Oligocene epoch}] Oligocene \Ol"i*go*cene\, a. [Oligo- Gr. ? new, recent.]
(Geol.) Of, pertaining to, or designating, certain strata which occupy an intermediate position between the Eocene and Miocene periods. -- n. The Oligocene period. See the Chart of {Geology}. [1913 Webster] Oligochaeta
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