形容词
中文翻译：周期性的
同义词：
['periodical', 'periodic', 'recurrent']
例句：
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1. The moon has a period of about 29.5 days.
月亮的周期大约是29.5天。
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2. The cycle of life is cyclical, meaning it repeats itself.
生命的循环意味着它自身重复。
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3. The temperature in this region varies with the seasons, showing a periodic pattern.
该地区的温度随季节变化，显示出周期性模式。