contact theorem

例句：

1. 1.The contact theorem states that the sum of the areas of two triangles is equal to the area of their intersection.
   接触定理表明，两个三角形的面积之和等于它们交点的面积。
2. 2. In physics, the contact theorem is used to describe how objects interact when they come into contact.
   在物理学中，接触定理用于描述物体接触时如何相互作用。
3. 3. The contact theorem has been applied in various fields, including engineering and economics,to analyze the impact of external factors on a system's performance.
   接触定理已被应用于工程和经济领域，以分析外部因素对系统性能的影响。