研究者将动物置于不变的黑暗环境中并记录它们的行为方式，通过这种标准的生活节律测试发现高脂饮也会影响动物的性能。
The high-fat diet also affected the animals' performance on a standard test of circadian rhythm, in which researchers keep animals in constant darkness and record their patterns of behavior.
人类的生活周期是24小时，这个周期的形成不只是因为有白天和黑夜，它还与人脑内主要的计时器昼夜节律钟有关。
Humans are pegged to a 24-hour cycle. We're locked into it not just by day and night-there's the master timepiece in the brain called the circadian clock.
作为一名摄影师，我的存在由人类日常生活的节律所驱动着：日复一日的放牧捕鱼，吟诵祷告，贩卖货品。
As a photographer, I am sustained by the rhythms of everyday life: the routines of herding and fishing; the chanting of prayers and the hawking of wares.
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