urolithus

例句：

1. 1. The doctor diagnosed him with a urinary calculus.
   医生诊断他患有尿结石。
2. 2. Urolithiasis is a common cause of kidney stones.
   尿结石是肾结石的常见原因。
3. 3. He had to undergo surgery to remove the large urinary calculus from his kidney.
   他不得不接受手术，从他的肾脏中取出大的尿结石。