The authors defined sleep fragmentation using an index of the number of sleep stage transitions per hour of sleep.

调查者使用每小时睡眠中睡眠时相变换的次数作为定义易醒的指标。

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In this paper, the authors defined the conception of information entropy of mine gas accumulation and gave the calculation formula.

作者定义了矿井瓦斯积聚信息熵的概念，并给出了其计算关系式。

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In this study, the authors defined moderate to heavy alcohol consumption as eight or more drinks for men and five or more drinks for women per week.

研究中，作者将中度到重度饮酒定义为男性一周8杯以上，女性一周5杯以上。

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At the moment, many publicity options for self-published authors rely on desperate people paying ridiculous sums of money for vaguely defined and often worthless services.

FORBES: New York Times Reviews Self-Published Book