circadian/sɝːˈkeɪ.di.ən/形容词(动植物的)昼夜的,约一日的,约24小时的(节律,周期)The authors discuss the evolutionary history of circadian systems in mammals, birds, insects, fungi, and bacteria.作者讨论了哺乳动物、鸟类、昆虫、真菌和细菌的昼夜节律系统的演化史。想跟读,去练习