
diurnal
词源
源自拉丁语 'diurnalis'(每日的),由 'dies'(日)派生而来,14世纪后期进入英语。
adjective
❶ 指与白天有关的,或发生在白天的。常用于描述生物活动或自然现象在日间的规律性变化。
“Most birds are diurnal, active during the day and resting at night.”
(大多数鸟类是昼行性的,白天活动,晚上休息。)
“The diurnal temperature variation is greater in deserts than in humid regions.”
(沙漠地区的昼夜温差比潮湿地区更大。)
❶ 在天文学中,指每天发生一次的,或与地球自转周期相关的现象。
“The diurnal motion of stars is caused by Earth's rotation.”
(恒星的周日运动是由地球自转引起的。)
“Diurnal parallax is used to measure distances to nearby celestial bodies.”
(周日视差被用来测量近距天体的距离。)
noun
❶ 指每日出版的报纸或刊物,尤指某些宗教团体的日课经书。
“The monastery's diurnal contains prayers for each hour of the day.”
(修道院的日课经书包含了一天中每个时段的祈祷文。)
“In the 18th century, several cities had their own diurnals reporting local news.”
(18世纪时,多个城市都有报道本地新闻的日报。)
常见短语
diurnal cycle — 指以24小时为周期的自然现象循环,如昼夜交替、温度变化等。
“Plants have adapted their photosynthesis to the diurnal cycle of light and darkness.”
(植物的光合作用已适应光暗交替的昼夜周期。)
diurnal variation — 描述某现象在一天之内发生的规律性变化,常用于气象、生理等领域。
“Doctors study the diurnal variation of blood pressure in hypertensive patients.”
(医生研究高血压患者血压的昼夜变化规律。)