名词
中文翻译：空产率
同义词：
['nulliparity', 'nulliparenthood', 'nulliparentalism例句：1. The study found that nulliparity is associated with an increased risk of breast cancer.（研究发现，空产率与乳腺癌风险增加有关。）']
例句：
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1. The study found that nulliparity is associated with an increased risk of breast cancer.
研究发现，空产率与乳腺癌风险增加有关。
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2.The researchers argue that nulliparity could be a factor in the decline of fertility rates.
研究人员认为，空产率可能是导致生育率下降的一个因素。
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3.The nulliparity rate has been steadily increasing over the past decade.
过去十年里，空产率一直在稳步上升。