urethral applicator

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 catheters are commonly used for treating urinary tract infections.
   尿道导管常用于治疗尿路感染。
3. 3. Duringthe surgery, the surgeonhad to insert a urethral catheter to monitorthe patient's urine output.
   手术期间，外科医生必须插入尿道导管来监测患者的尿量输出。