urethra

例句：

1. 1. The doctor inserted a catheter into his urethra to relieve the pain.
   医生将导管插入他的尿道以缓解疼痛。
2. 2. Urethra is a narrow tube that connects the kidneys to the bladder.
   尿道是连接肾脏和膀胱的狭窄管道。
3. 3. The patient was instructed to empty his bladder before undergoing surgery.
   病人被指示在手术前排空膀胱。