contractive ability of musculus levator ani

例句：

1. 1. The doctor explained that the patient's condition required a surgical procedure to improve the contractive ability of the anal sphincter.
   医生解释说，病人的状况需要手术来改善肛门括约肌的收缩能力。
2. 2. During childbirth, the anal sphincter plays a crucial role in maintaining the integrity ofthe fetal membranes.
   分娩期间，肛门括约肌在保持胎儿膜完整性方面起着至关重要的作用。
3. 3. A lack of exercise can lead to weakened anal sphincter function, which can increase the risk of incontinence.
   缺乏锻炼可能导致肛门括约肌功能减弱，这会增加尿失禁的风险。