昼夜节律 zhòu yè jié lǜ

DEFINITIONS

  1. circadian rhythm

CHARACTERS

昼 zhòu
HSK 6
daytime, daylight
夜 yè
HSK 5
night, dark; in night; by night
节 jié
HSK 3
knot, node, joint; section
律 lǜ
HSK 4
statute, principle, regulation