connected with the changes in the bodies of people or animals over each period of 24 hours （每 24 小时人或动物体内变化）昼夜节律的，生理节奏的 Jet lag occurs because jet travel ignores the circadian timekeeper. 发生时差是因为时差旅行忽略了生物钟。
Oxford Collocations DictionaryCircadian is used with these nouns:- clock
- rhythm
Word Origin1950s: formed irregularly from Latin circa ‘about’ + dies ‘day’.