几乎自然界中所有的物种，从单细胞生物到哺乳动物(包括人类)，都具有一种日常活动周期，称为昼夜节律。
Virtually all species in nature, from single-cell organisms to mammals, including humans, exhibit a daily cycle of activity called circadian rhythm.
虽然这个研究揭示了在苍蝇、老鼠、人类和植物对蓝光的反应是一样的，但是黄素类物质的减少对生物节律的作用却不同。
While this research reveals a similarity in the responses of flies, mice, humans, and plants to blue light, the decrease in flavins affects circadian rhythms differently.
早些年，约翰斯·霍普金斯大学的一位科学家发现，人类在全天24小时的昼夜节律周期中的生物功能改变可以被预测。
Some years ago, a Johns Hopkins scientist discovered that human beings experience predictable changes in biological functioning throughout the 24-hour (circadian) cycle of the day.
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