如何使用 "nulliparous" 造句

1. Labor analgesia and cesarean delivery : an individual patient meta-analysis of nulliparous women .
分娩镇痛和剖宫产:初产妇个体病人的meta-分析。
2. Inefficient uterine action is the most common cause of dystocia in the nulliparous gravida , especially early in labor .
宫缩乏力是初产妇难产最常见原因,尤其是第一产程。
3. Second-stage labor duration in nulliparous women : relationship to maternal and perinatal outcomes .
未产妇的第二产程持续时间:与产妇及新生儿围生期结局的相关性。