urethral surface

例句：

1. 1.The doctor examined the patient's urethral surface for signs of infection.
   医生检查了患者的尿道表面，以寻找感染的迹象。
2. 2. Urethral surfaces are sensitive to changes in pH levels.
   尿道表面对pH水平的变化非常敏感。
3. 3.During sexual intercourse, the urethral surface can become irritated and cause discomfort.
   在性行为期间，尿道表面可能会变得刺激并引起不适。