All human beings possess a body clock.
所有人都有一个生物钟。
We have studied the biological clock of human body for a century.
对于人体生物钟的研究已经有一个世纪了。
The human body has a biological clock, so life must be the law.
人的身体有一个生物钟，所以生活要有规律。
The human body has a biological clock, so life must be the law.
人的身体有一个生物钟，所以生活要有规律。
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