circadian
🇬🇧/sɜːˈkeɪdiən/ 🇺🇸/sɜːrˈkeɪdiən/ 4of or relating to biological processes that occur regularly at about 24-hour intervals, even in the absence of periodicity in the environment 生物作用的; 通常以24小时为一周期
adjective [原级]生理节奏的（指与地球二十四小时运转联系的新陈代谢、内分泌作用及睡眠等节奏有关的）；以24小时为周期的
Such a rhythm whose period is approximately—but not exactly—a day is called circadian.
这种以近似于——但不完全是——一天为周期的节律，叫做昼夜节律。
单词造句:
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- Not everyone has an identical circadian rhythm. 不是每个人都有相同的生理节律。
- This is a benign variation within circadian rhythms known as a chronotype. 这是一种被称为睡眠类型的昼夜节律的良性变化。