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1.The activity variance of the company has increased significantly in recent years.
该公司的活动变异近年来显著增加。
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2. The study found that the activity variance of the population is closely related to the economic growth rate.
研究发现，人口的活动变异与经济增长率密切相关。
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3. The research team analyzed the activity variance of the data and found that it was due to random errors.
研究团队分析了数据的活动变异，并发现是由于随机误差导致的。