昼夜节律晝夜節律

zhòu yè jié lǜ

Meaning

circadian rhythm

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Characters

昼zhòudaytime, daylight尺旦夜yènight, dark; under cover of night亠亻夕节jiéfestival; knot, joint; segment; to economize, to save艹律lǜstatute, principle, regulation彳聿