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。
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。
However, for beginners, the cycle structure of the three structures is the difficulty of studying the most difficult to master.
但是，对于初学者来说，循环结构的学习难度也是三大结构之最，较难掌握。
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