名词
中文翻译：Unknown
同义词：
['periodic', 'periodicals', 'periodicity']
例句：
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1.The magazine has a monthly circulation of 50,000.
这本杂志每月发行量为50,000份。
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2. The scientists found that the periodic changes in temperature were related to the sun's position.
科学家们发现，温度周期性的变化与太阳的位置有关。
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3. The periodic table is used to describe the chemical elements in the periodic system.
元素周期表用于描述元素周期系统中的化学元素。