The results showed that methane emission had obvious daily and seasonal variation law in rice-duck complex ecosystem.

结果表明：稻鸭复和生态系统中甲烷排放具有明显的日变化规律和季节变化规律。

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With the increase of soil depth, daily variation amplitude of soil temperature decreases.

随着土壤深度的增加，地温日变幅逐渐减小。

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The result shows that there exists the influence of sun activity on the atmosphere not only in long period variation but also in daily variation.

结果表明，太阳活动对大气的影响，不仅在长周期变化中存在，在逐日变化过程中也同样存在。

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By Tompion's death, in 1713, daily variation was less than a minute, and by the late 19th century, marine chronometers were accurate to fractions of a second per day.

FORBES: Magazine Article

The National Statistics figures also showed there was a daily variation, something which has been seen since the 1970s, with more children born on weekdays compared to weekends and bank holidays.

BBC: Wintry nights spark summer births

Third, the child with bipolar disorder often has a daily variation: he becomes highly active at night and in the morning he is like a hibernating bear, all but impossible to get out of bed.

NPR: Excerpt: 'Delivered from Distraction'