名词
中文翻译：活动量恒定的
同义词：
['activity level', 'activity intensity']
例句：
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1. The study found that the activity level of the population had increased significantly.
研究发现，人口的活动水平显著提高。
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2. The athletes were required to maintain a constant activity level throughout the competition.
运动员被要求在整个比赛中保持恒定的活动水平。
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3. The researcher analyzed the data to determine if the activity level of the participants was consistent across different sessions.
研究者分析了数据，以确定参与者在不同时间段的活动水平是否一致。