urethral sound

例句：

1. 1.The doctor inserted a urethral catheter into his patient's bladder to relieve pain.
   医生将一根尿道导管插入病人的膀胱以缓解疼痛。
2. 2. Urethral discharge is a common symptom of gonorrhea.
   尿道分泌物是淋病的一个常见症状。
3. 3.During sexual intercourse, the urethral opening remains closed to prevent infection.
   在性交过程中，尿道开口保持闭合以防止感染。