名词
中文翻译：循环因子
同义词：
['circulatory factor', 'circulation rate', 'circulation index']
例句：
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1. The new model has a higher circulation factor than the old one.
这款新模型的循环因子比旧款高。
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2. The increase in population has led to a decrease in the circulation factor of the city.
人口增长导致城市循环因子下降。
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3. The researchers found that the circulation factor was closely related to the health of the population.
研究人员发现，循环因子与人口健康密切相关。