calculus of lower urinary tract

例句：

1. 1. In the field of mathematics, calculus is a fundamental tool for solving complex problems.
   在数学领域，微积分是解决复杂问题的基本工具。
2. 2. The calculus of lower urinary tract is used to study the mechanics of urine flow through the urethra.
   下尿路的微积分用于研究尿液通过尿道的运动力学。
3. 3. The calculus of lower urinary tract is an important part of medical education, as it helps students understand the physiological mechanismsinvolved in urinary function.
   下尿路的微积分是医学教育的重要组成部分，因为它帮助学生理解与尿功能相关的生理机制。