diurnal

/daɪˈɝ.nəl/ 形容词 C2

中文：日间的

Happening or occurring during daylight, or primarily active during that time. · Most birds are diurnal.
Said of a flower that is open, or releasing its perfume during daylight hours, but not at night.
Having a daily cycle that is completed every 24 hours, usually referring to tasks, processes, tides, or sunrise to sunset; circadian.
Done once every day; daily, quotidian.

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