形容词
中文翻译：Unknown
同义词：
['cyclical', 'recurrent', 'regular']
例句：
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1.The temperature changes regularly during the day.
温度在一天中有规律地变化。
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2.The periodic table of elements is a model for understanding the periodicity of chemical properties.
元素周期表是理解化学性质周期性的一个模型。
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3.The moon has a regular cycle of phases that repeat every 29.5 days.
月亮有一个完整的周期，每29.5天重复一次。