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biology 生物 (of animals 动物 active during the day 日间活动的；昼行性的 Unlike most other bats, this species is diurnal. 这种蝙蝠与大多数蝙蝠不同，是在日间活动的。
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astronomy 天文学 taking one day 周日的 the diurnal rotation of the earth 地球的周日自转
Word Originlate Middle English (as a term in astronomy): from late Latin diurnalis, from Latin diurnus ‘daily’, from dies ‘day’.