Humans are pegged to a 24-hour cycle. We're locked into it not just by day and night-there's the master timepiece in the brain called the circadian clock.

人类的生活周期是24小时，这个周期的形成不只是因为有白天和黑夜，它还与人脑内主要的计时器昼夜节律钟有关。

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Startups that master speed, tempo and pivot cycle time will win.

把握了速度、节奏和关键性运转周期的新创企业将取得成功。

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I am the enjoyer and Ultimate Master of all performance of sacrifice; but they do not know Me in reality, consequently they revolve in the cycle of rebirth.

“我”是所有祭奉的享受者和最终的主人。但是他们并不认识处于本体中的“我”。因此，他们就会在生死中轮回。

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The BBC's diplomatic correspondent, Jonathan Marcus, says the exploitation of these mines underscores Tehran's determination to master and operate the full scope of the nuclear fuel cycle from uranium extraction, processing, enrichment and ultimately the manufacture of nuclear fuel.

BBC: Iran unveils uranium activities at Saghand and Ardakan