urethral calculus

例句：

1. 1.Urethral calculi are a common cause of urinary tract infections.
   尿道结石是尿路感染的常见原因。
2. 2.The patient was admitted to the hospital for treatment of a urethral calculus.
   患者因尿道结石入院治疗。
3. 3.Urethral calculi can be treated with medication or surgery depending on the severity of the condition.
   根据病情的严重程度，尿道结石可以通过药物治疗或手术来治疗。