What they found was a daily cycle of positive and negative feelings that seemed to apply consistently across cultures, geographies, and time zones.

研究发现，受访者不论来自哪种文化、地域和时区，积极与消极情绪几乎每天都在交替循环。

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Virtually all species in nature, from single-cell organisms to mammals, including humans, exhibit a daily cycle of activity called circadian rhythm.

几乎自然界中所有的物种，从单细胞生物到哺乳动物(包括人类)，都具有一种日常活动周期，称为昼夜节律。

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A daily cycle can have multiple peaks, as in the financial industry, where there are often major peaks just after markets open and just before they close.

每天可能会有多个峰值期，例如，在金融行业，在刚开市后和即将闭市前都有大的峰值期。

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The daily cycle of higher pressure in the morning and lower pressure in the evening results from daytime heating of the atmosphere by the sun.

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Rubio has attempted to run an under-the-radar White House campaign that places little emphasis on winning the daily news cycle, and he has expressed exasperation with the media's fascination with Trump's every move.

CNN: Donald Trump hits Marco Rubio on immigration - CNNPolitics.com

Gareth Pierce, chief executive of WJEC, later told the MPs the information filmed by the Daily Telegraph regarding the "cycle" of exam questions - which topics would be set each year - was already in the public domain.

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