integral of living force

例句：

1. 1. The concept of integral isfundamental to the study of physics.
   积分概念是物理学研究的基础。
2. 2. The company's financial performance is closely related toits market share and sales volume.
   公司的财务状况与其市场份额和销售量密切相关。
3. 3. Theintegral of a circle isthe area under the curve.
   圆的积分是曲线下的面积。