Quaternary
plural of masterpiece
A surname.
(geology) The geological period of the Cenozoic Era immediately following the Tertiary. It is subdivided into the Pleistocene and the Holocene Epochs.
(Internet slang) Frightening urban legends and short stories circulated on the Internet.
氷堆積物を研究していた科学者たちは、多くの大型哺乳類が第四紀（更新世と完新世を含む）の間に大陸を横断して移動したと結論づけた。
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