Human biological rhythms are related to the natural cycle of day and night.

人的生物节奏与昼夜的自然循环有关.

辞典例句

The money raising is part of a natural cycle.

筹资是自然周期的一部分.

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It is neither his fault nor her fault. It is a natural cycle.

这既非他的错,也非她的错, 而是由自然的周期.

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