optimal regulator problem

例句：

1. 1. The optimal temperature for growing vegetables is between 60°F and 85°F.
   蔬菜生长的最佳温度在60°F到85°F之间。
2. 2. The optimal solution to this problem would be to reduce the number of resources used.
   解决这个问题的最佳方案是减少资源的使用量。
3. 3. The optimal design should consider both functionality and cost-effectiveness.
   最佳设计应该兼顾功能性和成本效益。