“生物钟”(bio-logical clock),是指生物体内许多器官的功能呈现出与地球24小时运转以及和生物的睡—醒习惯等有密切关联的近似昼夜节奏变化(circadianrhythm change),或有近似月周期(Cira-trigintan)、年周期(Circannual)的节律变化。十八世纪中叶Linnaeus 氏第一次宣布植物按一定的时间间隔开花,并提出了“花钟”一词之后, The “bio-logical clock” refers to the circadian rhythm change in which the function of many organs in a living organism shows a close correlation with the functioning of the earth 24 hours and the sleep-wake habits of living things, or There is a rhythm change in Cira-trigintan, Circannual. The first time in the mid-eighteenth century Linnaeus declared that plants flowering at regular intervals and proposed the word “flower bell”