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periodicUK:*/ˌpɪəriˈɒdɪk/US:/ˌpɪriˈɑdɪk/US:(pēr′ē od′ik; Chem. pûr′ī od′ik)UK-RP:UK-Yorkshire:Irish:Scottish:US Southern:Australian:Jamaican: 主要翻译 periodic adj (recurring regularly)周期性的，周期的；定期的The dentist recommends periodic cleanings. 复合形式： periodic table, periodic table of elements n (chart of the chemical elements)元素周期表The noble gases are in the last column of the periodic table. |