urine formation

例句：

1. 1. The process of urine formation is essential for the body's waste removal system.
   尿的形成过程对于身体的废物排除系统至关重要。
2. 2. During the night, the body produces urine to help remove excess fluids and waste products.
   在夜间，身体会产生尿以帮助排除多余的液体和废物。
3. 3. Urine formation can be influenced by factors such as diet, exercise, and stress levels.
   尿的形成受到饮食、运动和压力水平等因素的影响。