theorem of least work

例句：

1. 1.The theorem of least work is a fundamental concept in mechanics.
   最小功原理是力学中的一个基本概念。
2. 2. The theorem states that the area of a circle is equal to pi times the radius squared.
   该定理指出，圆的面积等于π乘以半径的平方。
3. 3. In mathematics, the theorem of Pythagoras is widely used to find the length of a side in a right-angled triangle.
   在数学中，毕达哥拉斯定理被广泛用来求直角三角形的边长。