calculi in urinary system

• 泌尿系结石

calculi in urinary system的用法和样例：

例句

1. The accurate analysis of chemical composition and phases of urinary stones is the base of understanding the mechanism of formation of urolithiasis.
   准确分析尿石的化学成分和物相，有助于了解泌尿系结石的形成机制。