形容词
中文翻译：周期性的
同义词：
['periodical', 'periodic', 'periodic', 'periodic', 'periodic', 'periodic']
例句：
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1. The temperature changes regularly throughout the year.
温度一年四季有规律地变化。
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2. The project is planned to be completed within a certain period of time.
该项目计划在特定时间内完成。
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3. The research findings are published in periodic journals.
研究成果定期发表在期刊上。