the golden mean

例句：

1. 1. The golden mean is a mathematical concept that divides the circle into two equal parts.
   黄金分割是一个数学概念，将圆分为两个相等的部分。
2. 2. In art, the golden mean is often used to describe the ideal proportion between two elements.
   在艺术中，黄金分割通常用来描述两个元素之间的理想比例。
3. 3. The golden mean has been used in various fields such as architecture and engineering to achieve optimal results.
   黄金分割在建筑和工程等领域被用来达到最佳效果。