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单词 periodic
释义 periodicperiodicperiodic AC /ˌpɪəriˈɒdɪk◂ $ ˌpɪriˈɑː-/ (also periodicalperiodical) adjective happening a number of times but not frequently: periodic attacks of fluattack流行性感冒的定期爆发—periodicallyperiodically /-kli/ adverb: The river floods periodically.flood这条河周期性泛滥。
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