以下为句子列表：
英文: For nulliparous women (i.e., those who have never given birth) and who ever used OCs and nulliparous women who used OCs for at least 4 years, corresponding ORs were 1.24 and 1.29.
中文: 曾使用过口服避孕药和使用口服避孕药四年以上的未产妇（未生育的妇女）其相关性分别为1.24和1.29。
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英文: The cervical os is small and round, typical for a nulliparous woman.
中文: 宫颈外口小而圆，呈现未经产女性的特点。
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