Apoptosis is a normal physiological phenomenon.

细胞凋亡是一种正常的生理现象。

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Exercise fatigue is a normal physiological phenomenon during training.

运动性疲劳是运动训练中一种正常的生理现象。

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Abstract: : Exercise fatigue is a physiological phenomenon not only for athletes, but also for astronauts.

摘要：运动性疲劳不但是运动员，也是航天员易出现的生理现象。

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The hangover is an astonishingly complex physiological phenomenon, with dozens of symptoms and relatively little human trial data - rats and a few undergraduates are the preferred model for much of the relevant research.

BBC: US chemistry meeting tackles science of booze

But much of the difference in heart attack rate before and after Katrina is due to psychosocial risk factors, rather than basic physiological risk factors, say the researchers who studied the phenomenon.

FORBES: How Major Psychological Stressors Can Lead To Serious Health Problems