名词
中文翻译：正常周期
同义词：
['regular cycle', 'normal state', 'regular cycle']
例句：
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1. Thenormal cycle of the moon is about 29.5 days.
月亮的正常周期大约是29.5天。
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2. During the normal cycle, the earth revolves around the sun.
在正常的周期中，地球绕着太阳旋转。
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3. The normal cycle of life is marked by birth, growth, and death.
生命的正常周期以出生、成长和死亡为标志。