名词
中文翻译：性别指数
同义词：
['gender index', 'sex ratio index例句：1. The sex index of the population is 50% male and 50% female.（人口的性别指数是50%的男性和50%的女性。）']
例句：
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1. The sex index of the population is 50% male and 50% female.
人口的性别指数是50%的男性和50%的女性。
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2. The researchers found that the sex index was higher in urban areas than in rural areas.
研究人员发现，城市地区的性别指数高于农村地区。
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3.The sex index has been used to predict the fertility rate of a population.
性别指数被用来预测一个人口的生育率。