世间万物都存在固定的规律。清晨,太阳从东方蓬勃升起;夜晚,月亮和星辰闪耀在天空,这就是我们最熟悉的以“天”为单位的日周期。人类适应了这种节奏,日周期在漫长的进化过程中被写入我们体内 All things in the world have a fixed law. In the early morning, the sun rises vigorously from the east; the night, the moon and the stars shine in the sky, which is the most familiar day cycle in “day ”. Humankind has adapted to this rhythm and the daily cycle has been written into our body during the long evolutionary process