appearing or occurring at intervals
间歇的;周期(性)的;时而出现(或发生)的
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the periodic visits she made to her father .她对她父亲的定期探望。
【化】 元素周期表的;(周期表中)元素化学性能变化周期的
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the periodic law .周期律。
of or relating to a rhetorical period
完整句的。见<Bold>PERIOD</Bold>(义项 6)。
"mid 17th cent.: from French