periodicalKK [ˏpɪriˋɑdɪkəl] /ˌpɪɹiˈɑdɪkəl/發音名詞1期刊、雜誌The library keeps back issues of several academic periodicals.圖書館收藏了好幾種學術期刊的過期刊號。形容詞1定期的、定期出版的The department publishes a periodical report on air quality.該部門會定期發布空氣品質報告。2週期性的、間歇性的These periodical floods have damaged the riverside farmland.這些週期性的洪水已經毀壞了河邊的農地。