sphincter urethrae

例句：

1. 1.The sphincter urethrae is responsible for controlling the flow of urine from the bladder to the outside world.
   尿道括约肌负责控制膀胱中的尿液流向外部。
2. 2. During sexual intercourse, the sphincter urethrae helps to prevent the passage of sperm into the vagina.
   在性行为中，尿道括约肌帮助防止精子进入阴道。
3. 3. Injuries to the sphincter urethrae can lead to urinary incontinence, which canbe a significant source of embarrassment and distress.
   尿道括约肌的损伤可能导致尿失禁，这是一种常见的尴尬和痛苦来源。