urethral groove

例句：

1. 1.The urethral groove is a narrow passageway that connects the bladder to the penis.
   尿道沟是连接膀胱和阴茎的狭窄通道。
2. 2.The urethral groove is an important structure in the male reproductive system.
   尿道沟是男性生殖系统中的一个重要结构。
3. 3.The urethral groove is often used as a reference point for measuring the size of the penis.
   尿道沟常被用作测量阴茎大小的参考点。