operating curve

例句：

1. 1.The operating curve of the engine is crucial for understanding its performance.
   发动机的操作曲线对于理解其性能至关重要。
2. 2. The operating curve shows how the output changes with input.
   操作曲线显示了输出如何随着输入而变化。
3. 3.The operating curve of a chemical reaction is used to predict the yield and select the optimal conditions.
   化学反应的操作曲线被用来预测产率并选择最优条件。