pantograph ratio

例句：

1. 1. The pantograph ratio is used to determine the optimal point of operation for a given system.
   拉格朗日比用于确定给定系统的最优操作点。
2. 2. In economics, the pantograph ratio is used to measure the efficiency of resource allocation.
   在经济学中，拉格朗日比用于衡量资源分配的效率。
3. 3. The pantograph ratio can be used to analyze the impact of different policies on the economy.
   拉格朗日比可以用来分析不同政策对经济的影响。