英语阅读理解--a factor of 用法的理解

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/13 18:00:22

英语阅读理解--a factor of 用法的理解
有这么一句：In the United States,for instance ,the mortality rate for lung cancer among female non-smokers has not changed during the past 20 years.During the same period,the rate among female smokers has increased by a factor of half.
a factor of 是女性吸烟比例增长了一半还是增长到了一半呢?
谢谢~!

增长了50%

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