名词
中文翻译：保留率
同义词：
['retention rate', 'retention coefficient']
例句：
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1.The retention factor of this product is very high.
该产品的留存因子非常高。
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2. The retention factor of the data was calculated using a statistical method.
使用统计方法计算了数据的留存因子。
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3.The retention factor of the new drug is lower than that of the old one.
新药的留存因子比旧药低。