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vernal (adj.)[vernal 词源字典]: "pertaining to spring," 1530s, from Late Latin vernalis "of the spring," from vernus "of spring," from Latin ver "the spring, spring-time," from PIE *wesr- "the spring" (cognates: Old Norse var "spring," Greek ear, Armenian gar-un, Sanskrit vasantah, Persian bahar, Old Church Slavonic vesna "spring," Lithuanian vasara "summer").[vernal etymology, vernal origin, 英语词源]