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。
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。
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。
Susan says our skin also goes through a daily cycle - tending to be more absorbent and prone to allergic reactions first thing in the morning.
苏珊说我们的皮肤每天也有个循环：早晨皮肤容易吸收护肤品，也容易起过敏反应。
Like all birds, roosters call in a daily cycle determined by circadian rhythms.
和其他鸟类一样，生理节律决定了公鸡每天都要打鸣。
Like all birds, roosters call in a daily cycle determined by circadian rhythms.
和其他鸟类一样，生理节律决定了公鸡每天都要打鸣。
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