名词
中文翻译：相对周期
同义词：
['relative period', 'relative phase', 'relative state']
例句：
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1. The relative cycle of the earth's rotation is about 24 hours.
地球自转的相对周期大约是24小时。
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2. The relative cycle of the moon's phases can be observed from Earth.
从地球上可以观察到月亮相位的相对周期。
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3. The relative cycle of the sun's position in the sky is known as the solar year.
太阳在天空中的位置相对周期被称为太阳年。